Milpitas! South Bay. Up Calaveras Rd from Milpitas, Right on Calaveras Rd at Ed Levin Park, onto Felter Rd where it splits off, and onto Marsh Rd to reach the SE end of the Calaveras Reservoir to camp, or continue on Felter Rd to Sierra Rd and come down that way. A lot of climbing, a lot of descent.
Not sure about the camping, since it’s been 10 years, but you used to be able to camp in Ed Levin Park, and do the rest of the Sierra Rd ride the next morning. The views!