Red Light District
The Red Light District in Amsterdam is perhaps the city's most famous feature: legalized prostitution is pretty uncommon in the rest of the world. The prostitutes stand behind glass doors and try to draw your attention. Should you be interested, you approach a door and negotiate. I got an FAQ for some friends from the Prostitute Information Center, which says that the going rate is €40 for 15 minutes. The RLD also has the highest concentration of "coffeeshops:" places selling marijuana, hashish, and occasionally mushrooms.