Just FYI JDiver, the last time I called them crocs in a forum post, I was corrected, with people saying they are gators. LOL Can't win. But anyway, kids would like to see them. Right across from the Coba parking lot entrance, there's a guy who "calls" them by throwing chicken parts in the water.
OP said they've been to the "X" parks, so Xcaret would probably be one of those.
The canal float in the Sian Ka'an is the "real" float experience.
Add a note that the pole dancers are not from the Yucatan region. Colorful nevertheless.