Chankanaab sits on Cozumel's south side, inside the island's national reef marine park. The name comes from Maya, where chan means small and kanaab means ocean. The area was declared a protected area in 1980 and shelters the region's plants and animals.

A visit is mostly about the water and the beach. Snorkelers float over the reef right off the sand, and there is a lagoon with iguanas and a crocodile enclosure. The park also has a botanical garden and recreations of Maya villages, along walking trails.

• Snorkel gear is not included in basic entry. It can be rented at the park for a small fee, or brought from home.
• Mornings are the best time to visit, with fewer crowds and calmer sea.
• Cameras are strictly prohibited in the swim-with-animals area.
• Booking a park ticket online needs only a small deposit, with the balance paid on arrival. Booking ahead is recommended on busy days.