Also known as Cenote Manatee, this natural spring is completely open, unlike so many others in the region that are situated in caves. You can kayak or snorkel in the cenote’s small river, which is lined on either side by dense mangrove forests and is home to thousands of tiny fish that flit amid the underwater roots. You might also see blue crabs shuffling along the rock floor, and free-drivers exploring the depths. The entrance to the cenote is at its eastern end, where there’s a deep, pool-like area for relaxation as well as a large opening that leads to a tunnel connecting to the ocean. Casa Cenote is located inside the upscale coastal neighborhood of Tankah, on the southern Riviera Maya just north of Tulum.