You should plan $10/pp per day. This amount is divided among your cabin steward, waiter, assistant waiter, etc. It doesn't cover room service or the camp counselors. A 15% gratuity is automatically added to all drinks so you don't have to worry about tipping the bartender. I just have the tips put on my sign and sail card and then tipped extra to those who went above and beyond in cash. I found this much easier than trying to come up with the recommended amounts on the last night in cash and getting the proper amounts in each envelope.