Yes, you generally must pay an additional fee for shore excursions on a Disney cruise, which are officially called "Port Adventures." While your base cruise fare covers your stateroom, most meals, and onboard entertainment, activities off the ship are considered an add-on. These can range from $50 for a simple shuttle to a beach to over $500 for a private catamaran or helicopter tour. One notable exception occurs at Castaway Cay, Disney’s private island in the Bahamas: while specialized rentals like jet skis or snorkeling gear cost extra, the beach access, the island buffet lunch, and the "Castaway Cay 5K" are all included in your cruise fare. You can book Port Adventures through the Disney Cruise Line Navigator app or website as soon as your "booking window" opens, which is determined by your Castaway Club membership level. Booking early is highly recommended, as popular excursions in places like Alaska or Europe tend to sell out months in advance.