What are the "must do" dives in Yucatan, Mexico

I'm heading to the Yucatan Peninsula in Mexico this January for a few weeks of diving. There seems to be so many options. I'm trying to narrow down what are the best, "must do" dives that I shouldn't miss. Anyone been there and have any recommendations? What are the best Cenotes to dive? 

Aloha, 
Taj 

definately dive some Cenotes (Dos Ojos, Taj Ma Ha, Chac Mol (no photography allowed), Jardin de Eden etc) , best dive sites I found Los Arcos was my favorite

Visit Xibalba dive center, greetings to Robby,
that guy is one of the "deepest" explorers there...
And a dive in Angelita is different, but one is it worth...
Have joy and safe dives there!
Regards,
Wolfgang

So many good Cenotes. I'll second the Angelita recommendation. Very unique dive. I'd also say the Pit. Car Wash is also nice. I'd recommend diving with ProTec.