Going to Coz this Sat, stayin at the grand and diving with THE Sergios over at Aquatic Sports. Now that i am done bragging My girlfriend has inquired about cenote diving. Just from some quick browsing i see that there is not any cenote diving inside of Coz. I am assuming some sort of caven diving cert is required? Any dive ops do daily trips? Is it worth it? I have 3 snorkelers would it be "cool" for them to check out? Not worth the ferry ride? Any information would be appreciated. Oh did i tell you guys that im leaving for coz this sat?