I live and sail in SF. The CL listing is good, I have heard good things about him. Places like club natique, or ocsc, etc are good schools, but expensive for chartering, and you won't get one of their boats alone without a license and jumping through hoops.
The Ruby charter is a 60' beauty that charters daysails etc, but not much hands on. Josh(?) is a great guy and captain.(google ruby charter)
You will find more options in Sausalito than SF.
I would take you this weekend, but I will be out with relatives and kids, full boat already, sorry.
The race season is just starting to gear up here, so if worse comes to worse, you could troll the docks and find a crew spot.
Great men always have too much sail up. - Christopher Buckley
Vaya con Dios