Cozumel, a mostly undeveloped Mexican island in the Caribbean Sea, it is a popular cruise ship port of call famed for its scuba diving. At Arrecifes de Cozumel National Park, there's diving spots around a section of the Mesoamerican Reef and the Museo Subacuatico de Arte’s submerged sculptures. Chankanaab is an eco park surrounding a lagoon with underwater caverns, home…