Dip a toe in the waters of Chaak Tun Cenote. Weather permitting, you can go for a splash around or just sit back and enjoy spotting interesting birds.
There's a fee to enter this waterhole, which is situated in Playa del Carmen. But there's lots more to see around this area than just Chaak Tun Cenote. Xcaret Eco Theme Park, Playa del Carmen Main Beach and Mamitas Beach Club are also worth adding to your itinerary.