These are multi-use trails so watch out for horses and hikers. Most riders run it clockwise.
Flowing singletrack climbs to a rest area / viewpoint of Lake Folsom (cool breeze on hot days). Trail is well maintained with banking corners and not a lot of rocks, which makes climbing and downhills fast and fun. Several short "technical areas" some Granite slabs and small rock gardens (all on the downhill if you're going clockwise).
Watch for horses, they have a designated horses-only riding area but they like the views of the lake on the Mt. Bike/Hikers side. Early mornings or late afternoons are the best riding times for less traffic.
Need To Know
The trail length can be increased to 12 miles by starting at South Parking lot (just inside Park Gate) and adding the several trail loops including the water towers. To get to these loops at about mile 2.5 you'll come to a 4-way intersection. The track as mapped here shows you heading right down the hill - instead head straight through the intersection (left is a horse-trail), follow the trail uphill and you'll see a sign. This trail is up and back on the same trail, and the climb is steep and very washed out.
The trail is easily visible at the north end of the parking lot. It borders Park Rd. as a singletrack for about 3/4 mile before turning off to the right and heading into the hills bordering Folsom Lake. There are many intersecting trails but they all eventually come back to the loop shown in this track. At the first fork, take the left climbing fork to run the loop clockwise.
The hills are not steep or long and the singletrack has banked corners and curves constantly. At the the highest point on the trail is a rest area with benches and a great view of the lake (also a cool breeze on hot days). The area south of Beeks Bight has several short technical areas along with some nice granite to ride down.