For me, it would be to go around the infamous Nurburgring Race Circuit in Germany!
The race circuit, which in the past has hosted the German Grand Prix in the F1 World Championship, is the longest in the world, at just under 13 miles.
However, when it is not used for racing, it is open for the public to drive (not race!) around, as technically, it classes as a public road. While you are there, there is a cute small town as well, if racing isn't your thing!
What travel experience do you want to do?