I've been to the Barcelo Maya as well, it's a great resort, with lots to do during the day/evening. (It's actually where I met my Fiancee, small world)
As far as touring around, if you want to get asked to buy drugs, make sure to stop in at Playa del Carmen.
I found the scuba diving to be alot of fun too, but never got a chance to get to see Tulum or Chitzinitza. If you ever visit Belize or Guatemala, I would highly suggest visting the ruins of Tikal, they are spectacular.
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