3-Hour Northwest Coast Excursion: Aquarium and Islas Margaritas

The best part of this three-hour boat trip is its mix of things to do. You visit a small cave aquarium, cruise past Ibiza’s rocky coves, then stop at the Islas Margaritas for swimming in clear water. It gives you a quick look at the island from the sea without taking up a full day.

I like the friendly crew and included refreshments, especially the drinks, fruit, and snacks offered during the ride. I also like that masks, snorkels, swim noodles, and boogie boards are available, so you can enjoy the water without bringing much gear.

The main drawback is time. The aquarium visit lasts about 30 minutes, the swimming stop about 45 minutes, and the boat passes several coves without stopping. The aquarium is small, and some people may find the whole trip ends sooner than expected.

Key points to know before booking

• Natural cave aquarium: See rays, moray eels, groupers, octopuses, and other Mediterranean species inside a former fishermen’s cave.
• Northwest coast views: Cruise past Cala Gració, Cala Gracioneta, Cala Salada, Cala Saladeta, and Punta Galera.
• Swimming at Islas Margaritas: Enjoy about 45 minutes in a quiet bay with clear water and rocky islets nearby.
• Drinks and snacks included: Expect soft drinks, beer, sangria, fruit, and light refreshments during the outing.
• Useful water gear onboard: Masks, snorkels, swim noodles, and boogie boards are available to borrow.
• Simple San Antonio schedule: Meet at Capitán Nemo Ibiza at 11:00 a.m. and return to the same place.

Why this short boat trip works well in Ibiza

Ibiza is easy to associate with nightlife, but its northwest coast offers a quieter side of the island. This outing shows you that side in a compact format. You get a small dose of marine education, a scenic cruise, and time in the sea, all from a boat leaving San Antonio.

At $46.85 per person, the price is good if you plan to use the included extras. Aquarium entry is covered, and the boat provides drinks and snacks. You also get access to swimming equipment, which adds value for anyone who wants a casual water day without arranging a separate snorkeling rental.

I would not choose this as a serious snorkeling trip or a full coastal tour. The stop at Islas Margaritas is fairly short, and the boat only passes some of the coves. But for a relaxed half-day activity, the combination is appealing.

The boat can hold up to 100 people, so this is not a private sailing outing. The large capacity may appeal to families and groups who want a social atmosphere. If you prefer silence, privacy, or a small boat with personal attention, you should keep that in mind.

Starting at Capitán Nemo Ibiza in San Antonio

The meeting point is Capitán Nemo Ibiza on Passeig de la Mar in Sant Antoni de Portmany. The activity starts at 11:00 a.m. and returns to the same location, which keeps the logistics simple if you are staying in or near San Antonio.

A late-morning departure also makes sense for the swimming portion. You are not rushing out at dawn, and the schedule leaves part of the afternoon free. I would arrive early enough to find the meeting point and settle in before boarding, especially during the busy summer season.

Once onboard, look for the kind of seat that suits you. The boat has areas in both sun and shade, according to the practical details from the trip. Shade will matter on a bright day, while the open side gives you better views and more sun during the cruise.

The atmosphere is informal and social. The crew serves drinks, including soft drinks, beer, and sangria, along with light food such as fruit and snacks. One especially practical detail is the mention of watermelon and melon, a refreshing choice after time in the sun.

Aquarium Cap Blanc, a small cave with local sea life

The first major stop is Aquarium Cap Blanc, also called Sa Cova de Ses Llagostes. This is not a large modern aquarium with rows of tanks. It is a natural sea cave built into the west coast, once used by fishermen and later adapted as a place to show local marine life.

Seawater enters the cave naturally, helping create conditions closer to the animals’ coastal habitat. That gives the visit a strong sense of place. You are not simply looking at Mediterranean fish in an indoor exhibit. You are seeing them in a cave shaped by the sea and connected to the coast around you.

Inside, you might see groupers, gilt-head bream, sea bass, moray eels, rays, octopuses, and other native fish. The setting also supports a conservation and education purpose, so the visit gives you useful context about Ibiza’s marine ecosystem.

Allow about 30 minutes here. That is enough time for a quick look and some explanation, but not enough for a long museum visit. I like the stop because it feels unusual and local. It is also a good choice for families, since younger children can see recognizable sea creatures at close range without needing a long attention span.

Still, manage your expectations. The aquarium is small, and the visit may feel brief if you were expecting a large public aquarium. One person could easily decide that the cave alone is not worth the admission, but the stop works better when treated as one part of a coastal boat trip.

The aquarium is also a useful contrast with the rest of the day. You begin by looking at the sea from inside a cave, then spend the next part of the outing viewing Ibiza’s coast from the water itself.

Cala Gració and Cala Gracioneta from the boat

After the aquarium, the boat sails near Cala Gració and Cala Gracioneta. These two coves sit close to San Antonio and are known for calm water, golden sand, and easy access.

Cala Gració is the wider of the two. Cala Gracioneta is smaller and more enclosed, with a compact shape that gives it a more intimate feel. From the boat, you get a useful view of how the coves fit into the coastline and the wider bay.

The important point is that the boat does not stop here. You will not have time to walk onto the sand, swim from the beach, or explore the shore. Instead, the captain shares information as you pass, while you take photographs and enjoy the view from the sea.

That arrangement suits people who want a broad look at several places without spending the entire outing at one beach. It may disappoint you if your main goal is to swim at Cala Gració or Cala Gracioneta specifically. The trip offers a glimpse, not a beach visit.

Cala Salada, Cala Saladeta, and the northwest coast

The boat continues toward Cala Salada and Cala Saladeta, two of the most scenic coves on Ibiza’s northwest side. Pine trees and rocky cliffs frame the clear water, giving these spots a more protected and natural feel.

Again, the boat sails past without stopping. That is worth understanding before you book. You get time to appreciate the coves from offshore, but the only planned swim is at Islas Margaritas.

The captain explains details about the coves, their formation, and their place along Ibiza’s coast. This commentary adds value because it turns the ride into more than a simple cruise. You can watch the coastline while learning why the water and rock formations look the way they do.

I would sit where you can see both the shoreline and the open sea during this section. The coastline is the main attraction, and a seat in the shade may be more comfortable for staying outside with your camera. There is no promise that every passenger will have an uninterrupted view, particularly on a boat carrying as many as 100 people.

Punta Galera and its unusual rock formations

Punta Galera offers a different kind of scenery. Instead of a sandy cove, you see a rocky headland with steep cliffs and layered formations. From the water, the rock gives you a fresh angle on one of the northwest coast’s more distinctive natural points.

The boat sails close enough for you to take in the formations and surrounding sea. This is a photo-friendly part of the ride, especially if you like stark rock, open water, and wide coastal views more than beach scenes.

There is no land stop at Punta Galera. Think of it as a scenic pass-by, not an excursion ashore. The boat’s route lets you cover more coastline, but it also means you spend much of the trip seated and watching rather than walking or swimming.

Islas Margaritas, the main water stop

The highlight for many people will be the stop at Islas Margaritas, also known as Ses Margalides. These small rocky islets sit in the bay of Ses Balandres, off Ibiza’s west coast. The area is protected and known for clear water, turquoise tones, and a quieter feel than the island’s better-known beaches.

You get about 45 minutes here to swim, rest, and use the water equipment onboard. Masks and snorkels are available, along with swim noodles and boogie boards. That range of gear makes the stop approachable for different comfort levels in the water.

If you are a confident swimmer, you can use the time to look around the rocky shoreline and seabed. If you prefer to keep things easy, a noodle or boogie board lets you float without turning the stop into a demanding activity. The trip suits mixed groups because not everyone has to snorkel.

The water is the main reason to book this outing. The bay provides the chance to cool off in a natural setting, and the islets give the swim a stronger sense of place than a standard beach stop. You are surrounded by rocky coast rather than a developed waterfront.

The time limit is also the main weakness. Forty-five minutes can pass quickly once you account for getting ready, swimming, and returning equipment. Some people may want a longer water session or more snorkeling gear than is available. One rating specifically noted that there may not be enough full snorkeling sets or fins for everyone, so bring realistic expectations.

You should also remember that sea conditions and weather affect the quality of this stop. The activity requires good weather. If poor conditions force a cancellation, you will be offered another date or a full refund.

Food, drinks, and the onboard atmosphere

Included refreshments are a genuine part of the value here. You can expect soft drinks, beer, and sangria, plus snacks and fruit. Several comments highlight the drinks and melon, which can be especially welcome after swimming in the midday sun.

This is not a meal-focused cruise. The food is light, so you should not treat the included snacks as a substitute for lunch. But for a three-hour outing, the refreshments help keep the trip comfortable and remove the need to buy every drink onboard.

The crew receives strong praise for being friendly and helpful. That matters on a boat excursion, where small practical actions can shape the mood. The atmosphere is described as fun rather than formal, so this should suit families, friends, and couples who enjoy a sociable ride.

Bathrooms are available, though one rating suggested they could be improved. That is a minor point, but useful to know before you spend several hours on a boat. The trip is short enough that it should not create a major problem for most people.

Who should book the 3-hour excursion

I think this trip fits you best if you want a short, good-value boat outing with several different elements. It works especially well for:

• Families who want marine life, a swim, and snacks in one activity
• Couples looking for coastal views without committing to a full-day cruise
• Groups of friends who enjoy drinks and a casual social setting
• People staying in San Antonio who want a simple excursion from town
• Anyone who prefers a guided look at several coves rather than spending all day at one beach

I would choose another activity if you want a quiet private boat, a long snorkeling session, or substantial time on land. The large boat, short stops, and pass-by views make this a sampler of the coast rather than a slow, intimate sailing trip.

Most people can take part, and service animals are allowed. The activity is offered in English. It is also near public transportation, which helps if you are not staying within walking distance of the meeting point.

Price, timing, and cancellation advice

At $46.85, the outing offers reasonable value when you count the aquarium admission, drinks, snacks, fruit, and access to water equipment. The price is strongest for people who intend to swim and make use of the refreshments. If you plan to stay seated and skip the water, the value is less compelling.

The advertised duration is about three hours, though one comment said the trip did not quite reach that length. I would treat the timing as approximate rather than planning a tight connection afterward.

You can cancel for a full refund up to 24 hours before the 11:00 a.m. start time. Changes or cancellations made less than 24 hours ahead are not accepted for a refund. The activity also depends on a minimum number of participants, so a cancellation for that reason comes with a choice of another date or experience, or a full refund.

Should you book it?

Book this trip if you want an easy introduction to Ibiza’s northwest coast, with a real swim stop and useful extras included in the price. The cave aquarium is modest, but it is unusual, and the coastal route gives you far more than a simple boat transfer.

I would call it a good choice for families, first-time visitors, and anyone with only a few spare hours in San Antonio. Skip it if you want a private cruise, a serious snorkeling session, or long stops at Ibiza’s coves. For a relaxed half-day sampler with friendly service, drinks, snacks, and a memorable swim near Islas Margaritas, it makes a sensible booking.

FAQ

Where does the excursion start and finish?

It starts and ends at Capitán Nemo Ibiza, Passeig de la Mar, 07820 Sant Antoni de Portmany, Ibiza.

What time does the boat leave?

The scheduled start time is 11:00 a.m.

How long does the activity last?

The excursion lasts approximately three hours.

Is Aquarium Cap Blanc included?

Yes. Admission to Aquarium Cap Blanc is included in the price.

Does the boat stop at Cala Gració and Cala Salada?

No. The boat sails near Cala Gració, Cala Gracioneta, Cala Salada, Cala Saladeta, and Punta Galera without stopping there.

Can I swim or snorkel during the trip?

Yes. The boat stops at Islas Margaritas for about 45 minutes, where you can swim and use available water equipment such as masks, snorkels, swim noodles, and boogie boards.

What happens if the weather is bad?

If poor weather causes a cancellation, you will be offered a different date or a full refund.