Welcome aboard, William! Your family must be counting down the days until you set sail on the Fantasy next month!
Disney Cruise Line offers a wide variety of Port Adventures in each of their ports, including St. Maarten and St. Thomas. Booking your Port Adventures through Disney, instead of with an outside group, ensures that the ship knows where you are and the adventure guides know when you need to be back onboard. Add the extra magic that only Disney can provide on their Port Adventures and you'll be in for some great excursions.
Check out
Disney Cruise Line's Port Adventures in St. Thomas and St. Maarten. I'm sure you'll find a few that seem like the perfect fit for your family. Port Adventures with Disney meet usually onboard the ship and the group travels off together to head out onto the adventure. Your meeting time and location can be found on the Port Adventure tickets that will be waiting in your stateroom upon arrival. I do recommend taking a look sooner than later, as some adventures do fill up. Since you're sailing so soon, don't wait too long to book your adventures. You can book these by
logging into your reservation online and choosing activities for each port under your online check-in.
I hope that helps as you continue to plan for your magical sailing with Disney, William! Let me know if I can help with anything else before you set sail!