Welcome aboard, Brian! Congratulations on your upcoming wedding and honeymoon! Setting sail on the Disney Fantasy is going to be the perfect way to begin your married life! I'm excited for you!
In St. Thomas and St. John, check out the
Caribbean Sea Safari, Snorkeling & Beach Tour. Not only will you get a tour of the islands from the water, but you'll be riding a power catamaran, which is an adventure in itself. Guests then stop near Buck Island for about an hour of snorkeling. Then, your group will cruise over to Honeymoon Beach for an hour or so of relaxing beach time in this beautiful area. There is only one time in your life when you can enjoy part of your honeymoon ON Honeymoon Beach, so this is a must-do!
In St. Maarten, check out the See & Sea Island Tour or the St. Maarten Island and Butterfly Farm Tour. Both include tours of the island as well as a water tour on the first and a stop at the Butterfly Farm and shopping in the pretty village of Marigot on the second. It's like getting a few adventures for one price, Brian!
Finally, to save money, the best port in which to skip a Port Adventure would definitely be Castaway Cay. There is so much going on on Disney's private island, you could spend all day exploring and relaxing and still not see it all. The nice thing about Castaway Cay is that if you find halfway through your day there that you'd like to go snorkeling or ride the bike trail, it's easy to rent equipment right then. Don't forget there are scheduled activities going on all day that are free for guests, so check your Personal Navigator for more details on the ship.
Have fun as you continue to plan, Brian. I'm happy to help if you have other questions!