Rio Secreto is one of the best excursions in the Caribbean

We went on an excursion to Rio Secreto during our Oasis of the Seas cruise to Cozumel and it was really amazing. It was about an hour traversing water in a cenote (about a mile and a half). The water wasn’t too deep, but there were several areas that were very, very, very tight. You can read the detailed account here.