I just booked a Carnival cruise. I don't know what this "automatic tipping" is that everyone is talking about. I chose to prepay my gratuities at the time of booking, which was my option and my choice. Using this option, Carnival does have a set amount per guest, per day, which includes all personnel. This is for the convenience of the traveler - you don't have to try to keep amounts of cash until the last night for your tipping. You receive a voucher in your cruise documents that you insert into the tip envelope for your cabin steward, waiter, and bus boy. Tipping for other personnel, or in greater amounts, is still always at your discretion.