Cozumel’s National Marine Park is part of the Mesoamerican Barrier Reef System (SAM for its acronym in Spanish), second largest barrier reef in the world. The reef system is home to more than 65 species of stony coral, 350 species of mollusk and more than 500 species of fish. Either you are an experimented diver or you want to give it a try for the first time, Cozumel is the best place!