The thickest coin is a F 5 yellow vijfje and don't confuse it with the thinner, darker five cent coin. High interest rates on your unpaid balance notwithstanding, credit cards are the best way to pay whenever possible. And credit cards don't rip you off with surcharges foreign currency purchases. By the way, guilders are abbreviated hfl, fl, dfl or f for no good reason. Good service deserves a tip.
Bad service deserves nothing.
It's best to give the tip directly to the server or bartender, instead of leaving it on the table or bar. When he takes your money, it will go more smoothly to tell him the total you wish to pay. By the way, the check will never arrive unless you actually ask for it. Try to ride the Circle Tram 20, before they shut down. It makes a circle, kind of, from Centraal Station and links every major attraction into one meandering 50-minute loop through town.