Well, since you live in San Francisco you can travel to Hollister,
Williams (Williams Soaring Center), Crazy Creek on the other side of
the mountains from Calistoga or if you can travel a bit further there
is Minden, Truckee......and a glider ...take a look at
www.wingsandwheels.com Hope this would help.

Jacek Kobiesa
Washington State
ex-San Francisco