Join Date: Mar 2002
Location: California Central Coast
The ride up Mt. Hamilton to the observatory and down the backside to Livermore via Mines Road is excellent. The road is narrow and often dirty, but very twisty and an absolute hoot to ride. Total distance is well over 70 miles, and the only stops are at the observatory (rest rooms, Coke machine, fabulous view in good weather) and the Junction, where Mines intersects Del Puerto Canyon, which leads out to I5. No gas is available anywhere en route, so fill up in San Jose.
Mt. Diablo is OK, but it's inside a state park and will cost you $5 to get in. Oddly, I rode it only a few times when I lived 5 miles from the northern park entrance.