Mexico has more than a thousand islands, but a small handful stand out for scenery, wildlife, and the kind of protection that keeps them worth visiting. The eight on this list stretch from the Caribbean to the Pacific, and each one asks something different of you, from a short ferry ride to a serious liveaboard dive trip. Here's how we rank them, and what to know before you go.
Mexico's Caribbean and Pacific Islands
Every island on this list sits in or beside a protected natural area, with rules and seasons that shape the trip. Some are easy family ferry rides. Others ask for real swimming or advanced dive certifications.
1. The Marietas Islands, Our Home Archipelago
We put the Marietas first because Hidden Beach sits inside a protected archipelago we reach directly from Banderas Bay. These uninhabited volcanic islands have a strange origin. The Mexican government once used them for military testing, and decades of erosion around the explosion craters carved the open-roofed cove that holds Hidden Beach, a stretch of sand walled in by rock and open to the sky.
Jacques Cousteau led the outcry that eventually protected them, and today they're a national park, a Ramsar wetland, and a UNESCO Biosphere Reserve. Dozens of bird species nest here, including blue-footed boobies and what is very probably the world's largest brown booby colony. Underwater, three ocean currents converge, giving the park the greatest diversity of reef fish in Banderas Bay.
Our Marietas Tours
- The Marietas Islands & Beach BBQ tour pairs snorkeling through the rock archways with a beach lunch at Majahuitas.
- The Hidden Beach Marietas Islands tour takes you through the cave tunnel to the crater beach itself.
- Certified divers can book Marietas Islands Scuba Diving, where giant mantas pass over reefs used by zebra morays and sea turtles.
2. Isla Mujeres, Where Mayan History Meets Easy Beach Days
Isla Mujeres is a 20-minute ferry ride from Cancún and an easy island in Mexico to enjoy with kids or grandparents. Playa Norte anchors the beach day, and families get around the whole island by golf cart.
At Punta Sur, the ruins of a temple to the Mayan goddess Ixchel still stand above the cliffs. The island got its name in 1517, when Spanish explorers found female figurines left at the shrine. Ixchel was revered for fertility, medicine, and happiness, and Maya women still make the pilgrimage today.
3. Holbox, the Car-Free Slow Lane
Holbox still has sandy streets, with golf carts and bicycles handling most island travel, and the whole island sits inside the Yum Balam nature reserve. Ferries leave the port of Chiquilá every half hour during the day, and the crossing takes about 15 minutes.
Whale sharks gather offshore from June through September, with tours to swim beside them. Bioluminescence glows brightest from May through September, ideally in July or August during a waning moon around midnight. From April to October, flamingos wade at Punta Mosquito.
Come in winter instead and you trade the whale sharks for quiet beaches and soft light, which is its own reward.
4. Espíritu Santo, Another Contender for Mexico's Galápagos
Espíritu Santo belongs to the Gulf of California UNESCO World Heritage property, a sea rich in fish species and home to roughly a third of the world's marine mammals. The black jackrabbit lives here and nowhere else on the planet.
At Los Islotes, about an hour by boat from La Paz, visitors come for the sea lion colony. Swimming with the colony is permitted from September 1 through May 31 and closed June through August so the sea lions can breed. Pack everything you need for the day. There's no fresh water on the island.
5. Cozumel and Its Marine Mosaic
Cozumel sits on the Mesoamerican Reef, the second-largest reef system on the planet, stretching more than 600 miles (1,000 km) across four countries. The Arrecifes de Cozumel National Park has protected most of the island's reef since 1996.
Visibility hovers around 100 feet year-round, water stays between 78 and 82°F (26 to 28°C), and Palancar Reef alone stretches over 3.5 miles with a wall descending past 3,000 feet.
At El Cielo, a shallow sandbar inside the marine park, starfish gather in numbers that stop people mid-swim. Admire them where they lie. Even 30 seconds out of the water causes them serious stress, and touching or lifting them is prohibited.
Divers should also keep an eye out for the splendid toadfish, an endangered species that lives in caves under the coral and is found almost nowhere else on Earth. Cooler months bring more eagle rays along the walls. May through October gives you the warmest, calmest water and the quietest dive sites, with hurricane risk as the honest trade-off.
6. Isla Isabel, the Pacific's Seabird City
Isla Isabel sits off the Riviera Nayarit coast, a small volcanic island that has been a national park since 1980. Jacques Cousteau filmed here, and more than 30,000 seabirds nest on the island, including magnificent frigatebirds and blue-footed boobies. In January 2024, a new decree added a large marine national park around the island and its islets.
Access is by permitted boat only, in groups of no more than 10, from San Blas or the closer launch at Boca de Camichín. It rarely appears on international island lists, which is exactly why birders and photographers love it.
7. Isla Contoy, the Bird Island With No Hotels
About 20 miles (30 km) north of Isla Mujeres, Isla Contoy has no hotels, no roads, and no permanent residents. It shelters more than 170 bird species, and four sea turtle species nest on its sand, which is why authorities cap visits at 200 people per day.
It's reachable only by permitted boat from Cancún or Isla Mujeres. Most trips include a snorkel stop at Ixlache Reef, part of the Mesoamerican Barrier Reef System, on the way out.
If you like your islands wild and your beaches empty, this is the Caribbean answer to that wish.
8. Revillagigedo, for Divers Who Dream About Giants
About 250 miles (400 km) off Baja California, the Revillagigedo Archipelago became a UNESCO World Heritage Site in 2016, and a 2017 decree banned fishing across more than 57,000 square miles of surrounding ocean. UNESCO highlights the giant manta rays here, which grow upwards of 7 meters across and approach divers in a way rarely seen anywhere else.
Marine biologists have documented hundreds of fish species and dozens of shark species in these waters. Be honest with yourself before you dream too hard. Access is by liveaboard dive vessel only, about 22 to 30 hours of sailing from Cabo San Lucas, and the diving suits experienced certified divers rather than families on a day trip.
Which Island Is Right for You?
- Cozumel, for certified divers who want dramatic wall dives, 100-foot visibility year-round, and easy access to the second-largest reef system on the planet.
- Isla Mujeres, for easy beach days with kids and grandparents, a short ferry from Cancún, plus golf-cart exploring and Mayan ruins above the cliffs.
- Holbox, for slow travel on sandy streets, whale sharks in summer, flamingos in spring, and bioluminescent water on warm moonless nights.
- Espíritu Santo, for swimming with the Los Islotes sea lion colony between September and May, in a sea often called Mexico's Galápagos.
- The Marietas, for confident swimmers who want to reach the crater beach through a rock tunnel, paired with world-class seabird colonies and winter humpback whales.
A Few Tips From Us Before You Board
A few practical notes we share before any island day:
- Sun protection. Wear a rash guard and a hat instead of relying on lotions. Marine parks here protect the coral carefully, and clothing works everywhere without any guesswork.
- Motion sickness. If boats sometimes get to you, take medication before departure rather than after you feel it. On board, sit near the middle of the vessel and keep your eyes on the horizon.
- Cash on hand. Bring some for dock fees and small purchases, since card payments aren't always available at piers and island stops.
- Book ahead. Every island on this list runs on caps, permits, or ferry schedules, which means walk-up access is rarely an option. Book several days ahead during high season, and keep a backup morning in your plan in case weather shifts your boat.
- Go with a guide. For our home islands, our captains and naturalists know the tides, the wildlife windows, and the quiet coves that a solo trip often misses. If the Marietas swim sounds like more than you want on vacation, our Luxury Yacht & Snorkeling day and our Las Caletas Beach & Adventure Park hideaway both trade the tunnel swim for a slower pace on the same coast.
- Hands off underwater. Some corals grow less than a tenth of an inch per year, and even the lightest touch can be harmful. Starfish at El Cielo, sea lions at Los Islotes, and nesting boobies at the Marietas all deserve the same respectful distance.
Your park entrance fees go directly back into managing and protecting these places, so every visit funds the rangers who keep the caps and rules working.
Choose Your Island and We'll Meet You at the Dock
Eight islands, one country, and a very different day depending on which boat you step onto. Some are for wall dives, some for slow travel, some for sea lions, and some for crater beaches and winter whales. What they share is protection, and the reason they've stayed beautiful is that people fought for them, from Cousteau's campaigns in the 1960s to the community efforts protecting reefs today.
Coral cover at the Marietas rose over the last decade of monitoring, the Mesoamerican Reef insurance program expanded to Cozumel's national park, and the UN recognized Mexico's island restoration work as a World Restoration Flagship in 2025. Visiting with a licensed guide is the simplest way to be part of that story instead of a strain on it.
If Banderas Bay is the corner of Mexico you'll be exploring, have a look at our full lineup of tours and pick the day that matches your pace. We'll meet you at the dock.
