Most shops have a written menu and will show you samples. Many also provide free rolling papers and little strips of cardboard that are used to make filter tips. It's considered polite to eat or drink something while at the coffeeshop. Most coffeeshops don't sell alcohol. So even as you hurry from shop to shop for the Cup, be patient.
Dutch service is unhurried and personal.
Many Americans talk loud and are overly impatient by Dutch standards. If you don't pay as you're served, you automatically run a tab. During the busy Cannabis Cup, it's easier to pay as you go. If you want to eat it, be careful. It can take an hour to feel the effects on an empty stomach, while if you've already eaten a meal, it can take two hours.