I'd say no to the coffee, but thats just me, I dont drink the crap anyway. As far as money I always offer at the end of the day, and I judge by how far we go. I usually offer $60 -$80 for the day. Some guys refuse it, others take some others take it all. Of course if we make a real long run and use the entire tank of fuel, I would feel the need to offer more $$$. The boaters are good guys, they arent there to make money off of you, they just want some help to cover expenses.