Hi AJ,
I didnt want to do the mexico, DR islands as so many others go there. My FI and I chose the Bahamas. There are so many great islands just for that country alone and lots of hotel choices. We are getting married at the 5+ star Riu Palace on Paradise Island in November. There is no age limits, but no planned activities for children. But, it is right beside Atlantis. I would definatly get a great travel agent and then decide where you want to go.
good luck choosing your destination. There are so many great ones out there.