Playa del Carmen is a coastal resort town in Mexico, along the Yucatán Peninsula's Riviera Maya strip of Caribbean shoreline. In the state of Quintana Roo, it's known for its palm-lined beaches and coral reefs. Its Quinta Avenida pedestrian thoroughfare runs parallel to the beach, with blocks of shops, restaurants and nightspots ranging from laid-back bars to dance clubs.
Cozumel, a mostly undeveloped Mexican island in the Caribbean Sea, 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 Subacuático de Arte's submerged sculptures. Chankanaab is an eco park surrounding a lagoon with underwater caverns, home to dolphins, manatees and sea turtles.