There are maps at the trailhead and there are several trails you can combine to make short or long loops. You start at about 2000 ft and drop into the forest on singletrack/doubletrack trails. The downhill can be long and fun, but remember you have to climb up eventually so save some energy. You may encounter a few rocky technical sections on the descent. There is a lot of tight, fast singletrack that curves in and out of the humongous redwoods. Some of the best singletrack I have ever ridden. The first time I went we took the Timberview Trail to the Virginia Mill Trail. Had to dismount and cross a creek at the Virgina Mill Trail because some trees were knocked down covering the trail. We climbed up on the South/North Leaf trails and finally took the El Corte de Madera Creek Trail back to Skeggs point. The trails are all well marked, I'll definitely be back to ride some of the other trails in the network. If you are looking for awesome downhill, sweet singletrack, or a test of your climbing abilities, this place has it all. A great place to get lost in the redwoods.
Take 280N (from San Jose) to Woodside Rd/Hwy 84 Exit. Turn left (west) onto Woodside Rd. Turn right onto Kings Mountain, at the Y-intersection, keep right on Kings Mountain. Pass Huddart State Park then turn left onto Skyline Blvd. The trailhead is on the right hand side, shortly before the Skeggs Point overlook, park at the overlook.
http://www.singletracks.com/item.php?c=1&i=75