Parque Nacional Marino Las Baulas

Lonely Planet review

Playa Grande is considered to be one of most important nesting sites in the entire world for the baula or leatherback turtle. In 1991, the entirety of the beach and adjacent lands (379 ha) along with 22,000 ha of ocean was designated as Marino Las Baulas National Park.

The ecology of the park is primarily composed of mangrove swamp, and it's possible to find all of the six mangrove species native to Costa Rica here. This habitat is ideal for caimans and crocodiles, as well as numerous bird species, including the beautiful roseate spoonbill. Other creatures to look for when visiting are howler monkeys, raccoons, coatis, otters and a variety of crabs. But, as is to be expected, the main attraction is the nesting of the world's largest turtles, which can weigh in excess of 400kg. Nesting season is from October to March, and it's fairly common for three or four leatherbacks to lay their eggs here on any given night.

The park office is located by the northern entrance to Playa Grande. Reservations for turtle watching can be made up to seven days in advance, and are recommended as places are limited.