The islands are a haven for creatures such as dolphins, manta rays, humpback whales, sea turtles, and blue-footed boobies. You can see wildlife from a boat, but visitors can only set foot on one area of the government-protected islands, a strip of sand dubbed the Hidden Beach.
Marietas Islands snorkeling and scuba diving tours from Sayulita and Puerto Vallarta are the most popular ways to experience the islands and their tropical fish and coral reef, and some tour companies sweeten the deal with open bars. Whale-watching tours also run in winter.
Diving and snorkeling tours typically last three to five hours, but some longer options include other activities such as kayaking.
Many diving tours require PADI certification, but beginner options are available.
There is a cap on the number of daily visitors, and while you don't need to obtain Marietas Islands tickets, you do need to book your tour in advance.
The boat ride from Punta de Mita on the Riviera Nayarit to Marietas Islands National Park takes about 45 minutes. Due to strict government protections, you must take a boat tour from a licensed tour operator.
The whale-watching season runs from December through March. For snorkeling and scuba diving, June through September offers the best visibility and warmest temperatures.
The Marietas Islands are an MAB Biosphere Reserve, meaning they are part of UNESCO's Man and the Biosphere program to improve the relationship between humans and the environment. Because the islands have become increasingly popular, causing interference and possible damage to the ecosystem, the Mexican government authority known as the National Commission of Natural Protected Areas (CONANP) has closed the islands to the public in the past. Enjoy visiting while you can and keep in mind the fragile nature of this important ecological environment.