Image by Luis Javier Sandoval Getty Images

On the west side of the highway, 23km south of Playa del Carmen, Cristalino is one of a series of wonderful cenotes. It’s easily accessible, only about 70m from the entrance gate to the Barceló Maya Beach Resort, which is just off the highway. Great for diving (or just launching yourself off the rocks into the water below).

Two more sinkholes, Azul and El Jardín del Edén, sit just south of Cristalino along the highway, but Cristalino is the best of the three for swimming.