North of San Francisco and west of San Rafael, the popular Bills Trail has been approved for mountain biking. The trail is under-going significant renovation to support mountain bikes, so make sure to call the park prior to heading out to make sure it is open. The Bill's Trail can be combined with Barnabe Road and Gravesite Road to make a good loop through the steep, redwood-covered hills of Marin County.
The park is 15 miles west of San Rafael on Sir Francis Drake Boulevard.
To reach the mountain biking trailhead for Bill's Trail from Point Reyes Station, go south on SR 1 for 2.3 miles. Turn left on Sir Francis Drake Blvd. and travel 4.25 miles, veering right at 1.8 miles.) Take a left at Devils Gulch and go less than 0.5 miles to the trailhead on the left.
Overall, Bills Trail is the 119th most popular mountain bike trail of all 132 mountain biking rides in California.