Crown Zellerbach Trail. Started at the Pisgah trailhead and rode to a point between miles 21 and 22 of the ride. At the point where I turned around the trail pretty much petered out...there was a big pool of water crossing the trail, and other obstructions, so I turned around. Reviewing the map later if I had gone just a bit further things would have opened up and I would have made it to Vernonia. So I left something to get done next time :-) The ride was fun, riding on a converted railway bed. Not much in the way of scenery but I did see a coyote, a rabbit, many birds, and a deer. Muddy from head to toe at the end of the ride. Took my old Gary Fisher Sugar 3 on the ride...really too much bike for something like this but the bike did well and I was thankful for the knobby tires in the sections with loose gravel. Flatted on the return trip and had to stop and reinflate the rear tire a couple of times to make it back to the trailhead. Will need to get new shoes before the next outing on this bike, my old mountain bike shoes are shot. All things considered this was great and the ride confirmed that I still get a kick out of riding on gravel and getting muddy from head to toe.