To swim in cenotes bring your swimsuit, a visor or goggles, and life jacket (even if you know how to swim).
To dive in Yucatan it's necessary to have a diving center presence, which you can request in Merida.
It is advisable to have proper diving certification, carry complete and in good condition equipment, and have a technical guide Dive Master or Full Cave Dive depending on the diving site.
It is advisable to bring biodegradable insect repellent and sunscreen, and water. Remember heat can be extreme, especially from April to September.
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.