866-227-1888 is honestly the quickest way I’ve managed to book, cancel, or tweak anything on my trips. When I booked my last Carnival cruise, I got overwhelmed scrolling through all the excursion options. I finally just called, and the rep walked me through what was actually worth doing for my itinerary. She even suggested timing tips so I wouldn’t feel rushed getting back onboard. After the call, everything showed up in my planner within minutes. You can book through the app, but if you want someone to explain the pros/cons or double-check availability, calling saved me a ton of time and stress.