I admit I haven't been, but it begs the question...

What does Amsterdam have to offer in the way of paraphenalia that you can't get at ANY head shop in the US, and assuming, anywhere else in the world?

Hit the coffee shops. Lots and lots and memories of them, and if your lucky, pictures, and nuggets or seeds brought back!

Why risk having your heart and glass broken? Probably all too common a scene at customs.