To swim in cenotes bring your swimsuit, a visor or goggles, and life jacket (even if you know how to swim).
It is advisable to bring biodegradable insect repellent and sunscreen, and water.
Every modification alters the ecosystem, leave nature sites, elements and its fauna as found.
Care for nature! Bring bags to take all your litter and garbage back with you; take special care of glassware and / or campfires.
Remember heat can be extreme, especially from April to September. Stay hydrated and dress accordingly.