This is going to be a dumb question as I have never been to Mr Sanchos before, but we will be there in January. How do you tip the waiters who take care of you? If you pay for the all inclusive, you don't have to pay "per drink"...do we just slip them a $20 bill at the end of the day....or give a couple $$$ per drink? Or can we prepay a tip when we get there?