The Rim Nordic XC course is a beautifully maintained system of interlinked singletracks/doubletracks/fire roads that offers limitless loop possibilities from as little as 4 miles up to 10 miles.
The area features some great tecnical ascents up singletrack switchbacks, as well as some hair raiser, tight down hill. And of course, there's plently of rolling singletrack to drop the hammer on!
If you like a good, challenging course, then check this out! In addition to what's been listed, you'll tackle rock/root drop offs, numerous stream crossings (particularly in season), a fallen log bridge, a some of the prettiest wild flower blooms in the San Bernardino mountains.
How to get there:
From any where in SoCal, take Hwy. 330 to Running Springs. It turns into Hwy. 18 as you head to Big Bear. About 5 miles past Running Springs, your at Snow Valley Ski Resort, which is on the right hand side. Rim Nordic's entrance is on the left hand side of the highway.