On Sir Francis Drake Blvd approx 2-2.5 mi north of Fairfax. Look for a dirt pullout on the left and a trailhead. This is basically the side entrance to White's Hill open space preserve. There is another similar sized pullout 200 feet later on the right side. If you go over the bridge or start heading downhill, you've gone too far.
There is a $5 daily fee to ride Marin's best single-track built for bicyclists by the Marin Bicycle Trails Council @ www.boyscouts-marin.org
Some of us may be slow climbers, or not- but the flow trail "Endor" is so fun. And we will do it again and again! Endor is the main event.
Open to advanced beginners and above- 1 1/2 mile climb up to Endor, and repeats of the flow trail until we're tired- then back down.
Grab some food nearby afterwards...
Carpooling is always a great idea! I have room for one from Santa Cruz or San Jose.