Riviera Maya. Tulum is the only Mayan site located on the coast. Xcaret eco-archaeological park, Sian Ka'an Biosphere, Xel-Ha, the ulitimate snorkeling site & swim along largest barrier reef in Northern Hemisphere. Sinkholes (cenotes) partaking in swimming the waters the Mayans considered sacred. Mayan villages to explore. Shop in Playa del Carmen's 5th Ave.