Cameron Diaz -- There's Something About Go-Karting

Cameron Diaz spent her weekend going full throttle ... or at least as much as one can behind the wheel of a go-kart.

Diaz was spotted in Carson, CA at a place called Go Kart World. We're told Cameron was there serving as a chaperone to a group of about seven boys and girls.

According to our spies, Cam picked up the tab for everyone ($25 a piece) and was quite the skilled racer. She seemed to take it quite seriously ... winning the first race and finishing second in the next.