Great Snorkeling
http://www.xelha.com/

Best tour company – reference
http://cancunmermaid.com

Awesome Caves
http://www.riosecreto.com/

… and interesting

http://www.cancunreservations.com/cave_crossing.asp
Yal-Ku lagoon and cave snorkeling at the Kantun-chi Ecopark cenotes

Museo Subacuático de Arte – Cancun
http://musacancun.org/english/

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