"Cenote Dos Ojos This cenote’s name, which means “Two Eyes” in Spanish, refers to its two separate pools that lead into a large cavern of incredibly clear water. At more than 40 miles long, Dos Ojos is the largest underwater cave system in the state and among the most popular and adventurous dive spots on the entire Riviera Maya. Snorkelers of all ages are welcome to take in the amazing scenery and gaze at divers as they explore far below. The cenote lies just a few minutes north of Tulum, a little over a mile off the main highway."