On the West side of the island there is an attraction you should not miss, the Chankanaab Park, a water theme park 10 minutes South of Downtown Cozumel.
There you will find a natural eco-system with an aquarium, a lagoon, a botanical garden and a Maya zone. In the park you can go snorkeling, swim with dolphins, see a sea lion show, and drink a cocktail or a juice under a palm tree, among many other things. Do not miss it!