Hi Paula!
Welcome to the Castaway Club! EEeee!!! (I love to squeal when I'm excited, too!) Since you've completed one Disney Cruise, you'll enjoy all the benefits of being a Silver Castaway Club Member during your upcoming second Disney Cruise sailing through the Caribbean.
When my family chooses Port Adventures, we love getting together and going through the descriptions of each excursion for each port of call. Unfortunately, I haven't sailed on a Southern Caribbean cruise, but I took a peek at the beautiful ports of call you'll be visiting this upcoming April. I'm currently sailing on the Disney Dream! Since I haven't experienced the adventures found in the Southern Caribbean, I've been asking Cast Members onboard who've sailed the Southern Caribbean itinerary for their opinions (and those given by Guests) of which Port Adventures might be great for your family to look into, given the interests you listed!
I've collected a few Southern Caribbean Port Adventure suggestions for you! Check out the
Sky Safari Ziplining in St. Kitts for a high-speed adventure for your family! We've loved every snorkel excursion we've experienced with Disney Cruise Line so I have no doubts
Stingray Swim and Snorkel in Antigua would be so much fun! Another Port Adventure that the Cast Members have heard great things about is the
Grand Anse Beach and Turtle Discovery in Martinique. There, your daughter will have the chance to see many of Crush's relatives while onboard a catamaran!
Hopefully these will give you a start with researching and planning fun excursions for your family!
Beth