Tail of the Dragon
I'm about a 6 hour drive from Tail of the Dragon, one of, if not the best 13 miles of more-or-less legal driving roads in the world. And today I returned from my third trip there and I want to recommend this journey to anyone within reasonable driving range from East Tennessee. If you are not aware of this Mecca for drivers, it is an isolated mountain highway, with no intersecting roads, that has 318 turns in 13 miles. The speed limit is 30 MPH but most of the turns are pushing it at 30. The road is banked perfectly. One run is tiring but exhilarating and 4 runs will be about all you want without a break. There is a really plush mountain lodge called Tapoco Lodge at the end of the run, and I highly recommend it. Nice, well appointed cabins and a really good restaurant and bar right on a beautiful river. Stay two nights if you can, and drive all day between the nights.
You have to be aware that it is possible to get a speeding ticket there. It is also possible to wreck your car if you drive beyond your limits. But aside from a track there are few better public places to really, really push your car and your driving abilities.
Google it. Go there if you are close enough. Last time I was there 6 motorcyclists from Norway shipped their bikes overseas just to drive this area. It's fun and challenging and...fun.