If, after doing a cenote or two you decide it's not for you a dive in the ocean could be worthwhile, We were just there in January, no one wanted to do a cenote ( 1/2 the group had done a few before the other half had no interest in "wet limestone lifeless holes in the ground", me personally been there done that, cool but...) so we did a 2 tank PDC reef. I would say the two reefs we dove were similar to what you get in the middle keys of Florida, patchy reefs in Sandy areas. Good amount of sea life. But if you have the time and inclination take the ferry over to Coz.