I wouldn't recommend riding in SF-been there, done that. Plenty of great rides if you want to take BART, just don't do SF.

We can arrange a ride up Mt Diablo if you are so inclined (no pun intended). That's a BART ride to Pleasant Hill.

If you go south of Berkeley on BART, JoBob can direct you to great riding spots. Heck, she might even be able to be a personal escort!