tipping should be for service above and beyond. If someone on the boat goes out of their way and does more then they are expected to do then I feel a few bucks is warranted. One night they wanted to close the piano bar, we wanted to hear more music so the bar itself closed but the piano player offered to stay and play a little more. We threw him a few bucks for his time. Does the guy that just does what he is paid to do deserve a tip? no.