Monster-truck rally meets Disneyland at Avalanche Park, the brainchild of experienced rock crawler Steve Rumore, who was concerned that permits to drive on public land were getting harder and harder to come by. So when his real-estate-broker wife saw this 830-acre ranch come up for sale, they pulled out the checkbook. Opened last year, the ranch is modeled after a ski area: Green runs are for beginning drivers; blue are for intermediate; triple black are for those with a death wish. "For the moment, we're asking everyone to stay on the marked trails," says Rumore. But a free-for-all area will open up soon -- as well as a repair shop, a concession stand, a hotel and a conference center.