15% is the usual gratuity expected in GCM, but there's always the option for more! Here in the UK we are find this kind of gouging astonishing, but then we have decent minimum wages here and there still isn't an overbearing tipping culture. I know in Cayman wages in the service sector can be as low as $6 per hour, don't ask me how anyone survives on that with the cost of living there! Fortunately avios, hotel points and a judicious timeshare purchase years ago keep travel and accommodation costs down so we can pay for F & B, hire cars and scuba diving on our trips!