Actually driving in these track days is about 10000 times more fun than watching. Every car guy MUST do it...it was the most fun I ever had even though I was a back marker. I never new it could be so much fun to be passed. I was not the slowest guy out there either and improved my lap times by 10 seconds between my first and last race. (did 6 runs total that day)
I also learned a lot about how to make my car (and me) faster for next time.
The group I ran with was
http://speedventures.com/
Check them out. More events coming to your area mrn. They are great guys. Rent the lap time transponder for the extra $20.00 for full track day enjoyment.
DO IT!!!!!!!!!! You wont regret it.