Brugge (late medieval town, but a serious tourist trap),

But don't let that stop you from going there, Brugge is one of the most gorgious and best preserved medieval towns of western europe. And it isn't that bad when it comes to $.

And if you decide to visit Amsterdam, don't waste time in the coffeeshops, they are as fun as losing a leg. Buy some gear and head to the Vondelpark, you can even ask the police for a light.