Pretty sure you can still bomb down, or try to climb, the ski hills at Snow Bowl. They were open for use back in '08. The JHS xc running team trains on them, and I used to incorporate them into a lot of my rides. Really fun, borderline out of control high speed downhilling. If you follow the fire road that starts as the Yellow trail at the end of the paved dam, and continue straight where the Yellow trail turns left at the top of the hill, you'll eventually come to a T intersection. (you can also make this route 90%+ singletrack via the Beaver Brook Trail, but you'll need to bring your technical skills and love of hike-a-biking.) Turn left and follow that fun double track for several miles, corssing the powerlines for a second time. You'll eventually end up on top of a ridge. Straight will take you down to either the HS or the Fire Tower access road, right will take you to the fire tower, left will take you to Snow Bowl.
Just be aware of hunting season, as this route will take you through both a WMA and legally hunted private land. Don't wear any white during hunting season and try to incorporate red or safety orange into your riding gear. That main fire road is an easement, and is legally accessible year round. If hunters try to give you sh!t, remember that you have every right to be on that fire road, but just try not to be an idiot about it. There's a diference between being smart and being right and dead.
Oh, and you WILL get your feet wet on this route.