I've ridden the Flow Trail at Soquel Demonstation Forest 3 times in the last six days. It's a 3.75 mile downhill that drops 1275 feet. See http://www.mbosc.org/current-projects/4-mile-flow-trail-at-demo/general-information/ for more information including pictures and a link to a map.
They opened some of the six segments previously and all six have been open since April. My friend rode it and said it was like "Skiing the trees after a 3 foot powder dump! Perfect slalom pass on the water ski!". To get to the trailhead and from trailhead to the top of the Flow requires some commitment. The trailhead is 10 miles from Summit Road and Highway 17. The last three miles are very winding and cross a few slides that can close the road. From the trailhead, it is almost 5 miles with an 800 foot climb to the the top of the Flow trail, then after riding the Flow, almost 4 miles, mostly uphill back to the trailhead.
Last Thursday, I drove to the main entrance of the Demonstration Forest on Highlands Way and rode with three guys up the paved road, then past the back entrance into adjoining Forest of Nisene Marks to get some single track instead of a fire road to the top of the hill. The guys leading also knew some other short alternate single tracks to the fire road that takes you to the Ridge trail, which goes past a heliport, then to the Flow. We rode down it, then mostly up the almost 4 miles to our cars. Total ride time almost 3.5 hours.
Today, I parked in the large lot across the bridge and rode mostly downhill over two miles, then up Sulphur Springs (mostly a fire road), then along mostly down Ridge trail to the Flow. After a quick break at the picnic tables at bottom (much quieter than last week when Civilian Conservation Core was running saws and chippers), I rode up about 1.5 miles to Sulphur Springs. This time I turned up the Corral Trail which is longer, more interesting and ends up a couple of hundred feet higher and has about a mile more single track along the Ridge Trail to get to the Flow. My total ride today was about 20 miles and included 3,000 feet of climbing took me about 4.5 hours (including some walking).
While I like the Flow, I find a lot of it is too hard packed, not that smooth and it requires too much braking. There are a lot of banked turns, but on many of them, then only soft surface is low, not on the banks. I like a softer, smoother surface and know another nearby flow-type trail and a couple near So. Tahoe that I prefer. If anyone if in the area and wants a tour, let me know. Weekdays are preferred as weekends can get crowded.
Sign near the top of the Flow. I assumed Don Templeton worked for the government agency who manages this land, but found that he was a mountain biker, skier and wind surfer whose friends along with Ibis, Fox, Bontrager, Specialized and many other sponsored the trail.
While there is a partially taco'ed wheel along the Flow trail, the nearest food is at the Summit Store about 5 miles away. There is also MJA Vineyards closer to the trailhead if you don't need to get something to eat immediately after your ride. I went there for a tasting after riding today. For $10, they let me try 9 red wines including a couple of $85 Cabs they made from Napa grapes. I bought a $45 red blend.