I'm going to post what no one else has yet... rent the most awesome car you want for a drive on the Nurburgring.
http://www.nuerburgring.de/en/drives...r-rentals.html
I just did it with my F31 and can only imagine what it would be like in a Porsche or Ferrari or something like that.
Make it a part of your trip to Germany if you are a fan of cars.