just came back from NCL Sea Cruise Wonderfull! Its not a problem at all removing or adjusting de service charge (Gratuities) of US$ p/p/d. They even have a form for that. You just need to go to te reception and tell them that you want to remove or adjust the gratuities. You wil need the fill in hou much money you want to deduct. Example a 7d cruise for 2 days will bay 2x10x7=140, if you dont want give any gratuities just fill in 140, if you want to give US$10 fill in 130 etc. Then you have to sign for it.. and voila .... thats it. Make sure that they process it by verify your end statment.