If you're talking about the Valley of the Gods, I've ridden it.
Depending on how comfortable you are with offroading, its definately do-able. There are big rocks, washboard, ruts, and steep grades but if you go slow and stay off the brakes, you shouldnt have a problem.
One of the concerns I had was that some of the rocks were big and sharp enough to cut through a sport-bike tire although I never had a problem.
Heres a video: http://www.youtube.com/watch?v=6TCbzJJt77g
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