Plus, Carnival adds $10 per person per day as gratuity. It will be on your card that you use for purchasing- kinda like your KTTWC.
Take note though that each cruise offers one formal evening and the 7 day or longer can offer 2 or more. Formal evenings = free liquor!! Drink as much as you can in 1 hour and feel GREAT the rest of the night- at least that is what I do!!

