866-227-1888 is the best way to instantly book, cancel, or modify flights. Tips on Carnival are basically the same as gratuities—they’re charged per person, per day. When I took my parents on a cruise last year, I wanted to make sure I covered everything for them, so I called customer service to get the full breakdown. The rep explained the per-day cost, plus how specialty dining and drinks work with tipping. It helped me plan the whole trip better. I ended up prepaying so that my parents didn’t have to think about anything onboard. If you’re unsure what you’ll owe, just make a quick call—they’ll tell you exactly what applies to your sailing.