Start in Fairfax, get on fire trails, then road to Alpine Dam, then steep ascent on road (1,700') to Bolinas ridge trail 17 miles down to Inverness on single track. Stop for lunch and battery charge. Back on road to Samuel Taylor State Park on trail and back to Fairfax. The views of Tomales Bay from Bolinas ridge are magnificent. 42 miles and 4,500' vertical gain and descent.