Start in Deer Park, take Deer Park fire road to Shaver Grade, turn right onto Sly Oaks Road to Lake Lagunitas, go around the lake on Lake Lagunitas Road then split right at the east fork then split right again to get onto Eldridge Grade to the summit, then turn around and head 9 miles downhill!
Deer Park, Fairfax
http://www.singletracks.com/item.php?c=1&i=8106