Brussels & Germany Recommendations Needed

In about two months time, a friend and I will be off on our 2009 Beerfest tour. Stops include Brussels, Cologne (aka Köln, which I prefer), Stuttgart, and Munich. I am now smack dab in the middle of the planning phase. Hotel rooms have been procured, and Airline tickets purchased. However, what I am lacking is for stuff to do.

Oh sure, we have plans for both Oktoberfest in Munich and the Cannstatter Wasen in Stuttgart. But we’re looking for other stuff to do as well.

If you’ve been to any of the cities mentioned above, or any of the surrounding regions (we’ll have a car), I would love to hear your recommendations. Everything from restaurants and markets, to beer halls and travel tips would be quite welcome. We have ten days of traveling, and I’d love to see how much stuff we can fit into our schedule.