Yep, you gotta eat at Poncho's Backyard! It is nice and has great food. I'm glad our tour guide recommended it.
At Costa Maya we went to the Chachhoben Ruins. We thoroughly enjoyed that.
At Grand Cayman, we visited Stingray City. Can't miss that one--it's really fun!
You'll love the Grandeur. We have been on the Grandeur twice and will definitely go again.