> But if you find yourselves at a loss for what to do one evening, do somehthing very simple: go for a walk.

Personally, I find that good advice in any European city. If that seems to boring, pick up a to-go package at one of the coffeehouses, I guarantee it will be more fun (you can really smoke anywhere, just be somewhat subtle about it, but you won't get in trouble regardless.) Go to the casino if that is your thing, but I never find it as fun as Vegas because all your fellow players usually will be speaking Dutch.

Pick up the orange BOOM! Chicago guides that litter most of the establishments, it has a lot of things to do and see, some good advice for getting around, and is a hilarious read.