I went to Andretti Indoor Karting in Roswell, GA yesterday and it was so much more fun than I expected.
The karts werent super fast but the were definitely quick through the straight sections.
I was destroying all of the people who were racing (but no one was really competitive).
This is the track. It was very twisty with two back to back straight(ish) sections that you could fly through. One of the last turns on the course was pretty challenging. I never managed to find a good line that I could hold.

I really want to find a similar track, maybe outdoors, with higher power karts! The ones at Andretti were 9 HP which was decent but some more low end would have been nice.