Carnival Cruise Line automatically adds a $12.95 per person, per day gratuity to onboard accounts. (Suite passengers pay $13.95 per person per day.) The tips are split among the crew who serve you each day: room stewards, and waiters and assistant waiters, for example. Passengers can prepay gratuities before they board Carnival Horizon or adjust them at any point during their cruise by visiting the passenger service desk. The gratuity policy applies to passengers 2 years and older.

All bar bills and spa treatment purchases come with an automatic 15 percent gratuity, which is not optional. You can tip room service staff in cash — a buck or two is appropriate though not required.

Gratuity Fees can be included in payment plans.