Marietas Islands and the Hidden Beach

The Marietas Islands are a pair of small volcanic islands in the northern mouth of Banderas Bay, protected as a national park and famous for the Hidden Beach, a sheltered sand pocket inside a collapsed crater that you can enter only by swimming through a short tunnel from the open sea. The islands also offer excellent snorkeling over reefs full of tropical fish, and boatloads of seabirds nest on the rocky cliffs. Because the park is protected, access is regulated: only authorized operators can bring visitors, group sizes and time on the beach are limited, and rules have changed over the years, so it pays to book with a licensed operator and confirm the current terms. The tour we link, a small-group snorkeling and beach experience, meets at the public pier in Punta de Mita, runs about three and a half hours with snorkel gear and snacks included, and carries a maximum of eight travelers, which keeps it far calmer than the big catamaran cruises. It is the right pick for people who want time in the water more than a party on deck, and who are comfortable swimming with a life jacket.

Getting there: Punta de Mita sits at the northern tip of Banderas Bay, roughly an hour by road from Puerto Vallarta, and the boat ride to the islands from there is short. Many operators also run longer trips from Puerto Vallarta and Nuevo Vallarta, with hotel pickup and a lunch on a catamaran, but these spend more time in transit. If you are staying in Puerto Vallarta, either arrange transfers or choose a tour with pickup, and start early, since morning departures usually have calmer water and clearer visibility.

What to expect at the Hidden Beach: boats cannot enter the tunnel, so visitors swim in with a mandatory life jacket and a guide, and recent reporting describes a daily visitor cap and a short time limit on the beach to protect the site. Those numbers can change, so treat them as indicative and check with your operator. Non-swimmers and small children should ask about the alternatives, because the islands have other beaches and snorkeling spots reached without the tunnel swim. You also pay modest park and port fees, sometimes included in the tour price and sometimes collected separately at the pier.

Timing and conditions: the water is warm and calm for much of the year, but swell and wind can cancel trips, so keep a flexible day in your schedule. From late November to March humpback whales pass through the area, and a boat may slow for a sighting. Bring reef-safe sunscreen, a towel, a hat and a waterproof phone pouch. Do not touch the coral or feed the birds, and follow your guide's instructions: the rules exist because heavy visitor numbers once damaged this fragile place.