Hi, Jessica! Welcome to planDisney. I'm so glad you stopped by as you are preparing for your first Disney Cruise. It's going to be amazing!
Disney Castaway Cay is one of my favorite places to go, and I can't wait for you to get there and explore. I found the following Port Adventure, and I believe it's the one you are talking about:
Watercraft Ski Adventure (C91). This Port Adventure looks to be for guests ages 10 and up. I'm sorry that's not the perfect fit for you. One Port Adventure that I love is
Castaway Ray's Stingray Adventure. You can learn about stingrays, have an opportunity to feed them, and snorkel among them. The whole experience is about an hour, so that leaves plenty of time for exploring the island in other ways. You might consider bike riding, playing at In Da Shade Games, relaxing in a hammock, or splashing into the ocean at Pelican Plunge.
There will also be some scheduled activities, so check the Daily Activity Schedule to see what's happening around the island. Want to try a special treat? Consider grabbing two giant cookies from the lunch buffet and sandwiching soft-serve ice cream between them. Yum!
Jessica, please cruise back to us if you have more questions. My panelist pals and I will be here for you!
Happy Planning,
Adrianna