We had a 5 race crit series on the local go- kart track, and it was awesome. I won my first crit there, and my roadracing background certainly helped. THe final three turns were a one line ( pretty technical ) which lead out on to a downhill sprint of about 75 yards to the finish line.
The other races I did were on a 1 mile course laid out in an industrial park. Basically a rectangle with the front and back straits about 1/3 mile. I had a harder time keeping with the lead group, but then again, they were my first races ever.
I also did one race in NY, and that was a TON of fun. ~1mile cours with a 180 hairpin and small climb before the ~1/4 straight to the finish made for some exciting racing.