Start in Livermore for an awesome Mines Road adventure.
Mines Road — 59.5 miles with 4,420 feet of climbing (approx 3,200 to Junction and 1,100 return) Note the cafe at the junction is not always open. You may want to carry some food.
If you need a shorter ride, you can ride to the county line and return — 43 miles and about 3,000 climbing. Additional information including map, cue sheets, and Garmin download is available here:
https://ridewithgps.com/routes/27350294
A lot of the ride is in the open and water is scarce. So two water bottles and sunscreen recommended.