Sonora? That's even better than Sonoma! x 10!!!
From Sonora you are right in the thick of the foothills, I think there are 7 great mountain passes you can hit in a day.... plus Yosemite!
49, 120, 108. Heck, even take 4 all the way up to Topaz! You really can't go wrong.
Here is a link to our local trip in a couple weeks, these guys do this every year and have a good routine figured out.......
Topaz May 24th-26th | South Bay Riders
Again, post up and let's ride! I've done day trips from Santa Cruz to Yosemite and back....