$20 for 15 minutes or $50 for 3 - 15 minute sessions.
It's not cheap, but you don't have to worry about breaking parts or wearing out tires since it's not your kart!

Also the karts aren't super powerful so it made me concentrate on my lines, braking and getting the most out of the kart.

Here is an aerial view of the track. The loop with the lake isn't used during open karting sessions, but is used during races.