Careful, my cousin got randomly violated twice when she was there and also got threatened at knife point. But her boyfriends also pretty crazy and took them to some pretty sketchy places, mostly in search of the drugs that aren't legal there.
But really there's not too much more you can do in Amsterdam than in America, besides getting weed legally and blowing some money on dirty STD infested hookers.... well and you can get authentic Absinthe. You use to be able to get shrooms there but somebody jumped off of some shit on them and now they're illegal, oh well.
Nonetheless it's a good choice of location and I wish I could go :-/