In MHO, I suppose it could be dangerous, if another rider hits you for example. But as long as you ride within your own ability, (I know I won't be trying to clear any tabletops!!!) I don't see the danger. Accidents happen, sure, but they could happen ANYWHERE at ANYTIME no matter where you ride!
I think I may try a ride there on my Z. I didn't realize there were so many sport ATV's that run there! It was packed last Sunday!