I did the Mario Andretti Racing School last Friday. It was the most heart stopping fun 5 minutes of my life. I did 8 laps and hit a top speed of 150mph. It went by so fast I couldn't believe it was over. I'm going back next year for the 14 lap (or more!) session. This could easily become addictive...good thing it's so far away.
I highly recommend this!
Me at 150mph on the front straight of Las Vegas Motor Speedway.