Five kilometers (3 mi) west of the main square and on the old highway to Chichén Itzá, you can swim with the catfish in lovely, mysterious Cenote X-Keken, which is in a cave lighted by a small natural skylight. There are toilets and changing facilities but no lockers. Directly across the street from Cenote X-Keken is Cenote Samula, equally stunning with crystal clear water and hundreds of birds nesting between the stalactites. Guides offer tours for tips.
Valladolid, Yucatán, Mexico