There's some really nice trails up in the Santa Clarita area (near Magic Mtn). They're all pretty easy, improved dirt roads with enough ruts and water crossings to keep things interesting. One of my favorites is Cold Water Cny (not 100% sure of that name). It runs between San Franciscito Cny Rd. to Lake Hughes Rd. above Castaic. It's great either way you go with most of the larger water crossings being in the last mile before Lake Hughes Rd. There are several roads that tie into the main trail, some actually go up some pretty good peaks, but most end at a gate. All the roads are super easy for anyone with 4wd and some common sense. Right below S.F. Rd is some type of steel building frame - my guess is that it has something to do with keeping debris from clogging the 10ft. diameter pipe that runs under the road. I've set up ropes off of this structure and sent my 8 yr old neice down on a pulley to make a really nice zip line. Even better, us "adults" rig up a pendulum inside the structure and swing inside attached via a harness - crazy scary and definately not something for the youngsters. Some parts of the trail are pretty narrow with significant drops if you go too fast so its best not to fly through. I'd be willing to lead a trip there for anyone who wants to go. I'll bring my ropes as well. I usually try to make all my trips midweek but I might be up for a weekend.