How to go santa clara to san francisco day tour by bus ? and from where? -

I would suggest you take Cal Train from Santa Clara to Millbrae, then transfer to BART. They are in the same station.Take BART to the Powell St. Station.That will put you right in the heart of Downtown and only two blocks or so from Union Sq. Before you go do an online search for the tour that you find most interesting. Make arrangements with them to pick you up somewhere near there.I really do not believe there are any tour buses that leave from the Santa Clara area.Enjoy your tour.

1 hour from santa clara to SF by train( $7.50), there are 3 popular tours available:City Pass $49 ( Including 7 days unlimited ride of Cable car and Muni, Blue Gold Bay Cruise, Aquarium of the bay, Exploratorium, de Young Museum, San Francisco Museum of Modern Art, Asian Museum or California Academy of Sciences )San Francisco City Bus Tour $39Double Decker CitySightSeeing (48 hr Hop on,Hop off) $50