We snorkeled in the cenotes in March and had a great time. It costs $14 to enter or you can chose to take the tour that gives you snorkel rental, transport from the highway to the cenote (1.5 km), entrance to a bat cave and a guide. It's up to you if you would like to do this and we did not find the agents pushy in trying to convince you to take this option. It costs about $40.
I would recommend bringing your own snorkel gear and taking a taxi to the cenotes as it will bring you right to the site. We took the collectivo and walked the 1.5 km but you can also take a little motorcycle cab for $5 from the highway to the cenote.
There are showers and washrooms, as well as some hammocks to relax between your snorkeling.
I would recommend it!
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