North of Santa Clarita, take San Francisquito Canyon Road a few miles north. After you pass a place called "A Place to Shoot" (a gun range), there is a dirt road on the left that connects San Francisquito to Lake Hughs Road. The first part of the road is the worst, because of the steep decline, but the car can handle it fine, and the rest of the ride is pretty fun. Not fast at all because it is so rough, but it is pretty exciting because you climb to the top of the mountain. What a view!!! The AWD accelaration is awesome, and some corners can be fun also as long as there arent' any ruts. I drove for about an hour off road.
Do not attempt this route if you have lowered your car.
I would love to go all out on this route, but alas I need a daily driver. Mabye in a few years.