Well...

There are several schools of tantra instruction happening near the bay area. My favorite is derived from Margot Anand and her work. Classes are generally taught at Harbin Hot Springs. Steve & Lokita also teach a number of courses aside from Margot's Love and Ecstacy Training, though. You can find out more here: ecstaticliving.com

Charles Muir also teaches weekend workshops periodically. You can find him here: www.sourcetantra.com

And the Ipsalu folks also teach a series of weekend workshops more or less locally.

You can get more info on any of these in the Bay Area Tantra tribe. bayareatantra.tribe.net