Apologies, searched through the boards and couldn't find an answer. We are first time cruises and have booked an upcoming cruise on Celebrity and NCL. With Celebrity, they let you pre-pay tips, which I assume goes for room and restaurant staff?? Meanwhile, NCL adds tips to Drink Packages for bartenders but doesn't otherwise have a pre-pay tip option, however, they do have an $20/day/person service charge, which is $600 on our cruise. Is this service charge a "tip" for room/restaurant staff??? Or will there be an end of the cruise tip option> Thank you!