Popsugar Family Family Travel Tips For Visiting Disney's Castaway Cay Private Island 15 Magical Tips For Anyone Visiting Disney's Private Island, Castaway Cay May 12, 2019 by Megan duBois View On One Page Photo 9 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 9 Adults Can Enjoy Serenity Bay Serenity Bay is the adults only beach at Castaway Cay. This quiet oasis is lined with beach chairs, hammocks, golden sand, and not a kid in sight! Previous Next Start Slideshow Family TravelDisneyDisney FoodTravelTravel Tips