Excellent !!!
For Sunday I was thinking some loop involving Niles Canyon, Palomares, Redwood Road, Pinehill, Canyon, Moraga Rd., Mt. Diablo Rd. thru Lafeyette, S Main in Walnut Creek, Dannville Blvd and Hartz into Danville, San Ramon Valley, San Ramon Rd., Foothill into Sunol, then, if the mood strikes, over Calaveras and via Mission Blvd back into Fremont (basically, the way back home we took on our ride up the backside of Sierra), or, if the mood doesn't strike, then the direct route from Sunol to Fremont via Niles Canyon. (This is basically the route I did last Saturday but cut short in Dublin. )
It would be about 90-ish miles without Calaveras, with about 3500 ft of climbing, and with Calaveras it would be about 125 miles with about 5000 feet. This is all off the top of my head but I can double check later.
This loop passes near lots of BART stations, and I don't need to start from Fremont.
2009 Lynskey R230 Houseblend - Brooks Team Pro
2007 Rivendell Bleriot - Rivet Pearl