Ahoy, William!
What wonderful memories you'll make with your grandchildren on your
Disney Dream cruise in December! My last sailing on the Disney Dream was in December, and it was the best weather I've ever experienced on
Castaway Cay! I hope you and your crew will enjoy the same sunny, 80 degree weather on your upcoming visit.
There are a lot of options to get out on the water in Castaway Cay, but at this time water skiing is not an available. I recommend checking out the Port Adventures offered on the island like the
Banana Boat Thrill Ride,
Parasailing and the
Watercraft Ski Adventure (Double). I'm not sure of the ages of your grandchildren, but the minimum age for all of these excursions is eight. To participate in the Watercraft Ski Adventure-Double one of the participants must be at least 18 to drive the watercraft. All of these can be booked ahead of time once your booking window opens up online. This will be 75 days prior to departure if this is your first Disney Cruise. There are a few splashtacular options not available to book until you arrive such as the boat rentals. These rentals include the Sea Kayak (5 and up), Hobie Cat (5 and up plus prior experience), Aqua Trike (4 and up), Paddle Boat ( Ages 4 and up) and Fun Kat (5 and up).
I hope something I've listed will peak your grandchildren's interest, William. If we can assist you with additional questions, please let us know!
Have a magical day!
Nancy