866-227-1888 has helped me make last-minute changes before boarding, but one thing I always forget until someone asks is room service. Carnival’s room service is partially free. On my last cruise, I’d wake up early, call for coffee and pastries, and it didn’t cost a thing. But later in the day, some menu items have small charges. I learned this after ordering a late-night sandwich and getting a modest bill—not a big deal, but not completely free either. Honestly, I still think it’s worth it for the convenience, especially mornings when you just want to relax on the balcony. If you’re someone who snacks constantly, you might end up paying a bit, but it’s still cheaper than most hotels. For light breakfast and simple items, the free options cover a lot.