In my experience, generally, the best meals for the trip take place on the boat.
How much of a service charge to you slip to the crew?
Well I am captain and cook. The menu is to prevent scurvy and mutinies.
I don't like included "tax/service charge/tip" because in my mind, it depreciates the value of really good service. If 20% is needed to stay profitable then raise the prices. It seem charging the same fee for carryout as dine in is insulting to the wait staff.