So I spend my life playing with fast cars, and the first time I'm on a track with my 23-year-old daughterthe backpacker with the Ivy League sociology degreeshe blows me into the bulrushes. Almost literally: The downhill chicane leading onto the main straight at Oakland Valley threatens to launch you right over the rumble strip into a cattail-bordered pond if you don't get the kart rotated and the power down early. That's right, go-karts.