• Sightseeing Tours

Tower Tours
http://www.towertours.net/

Grayline Tours
http://www.grayline.com/

Super Sightseeing Tours
http://www.supersightseeing.com/

• Boat Tours

San Francisco Seaplane Tours
http://www.seaplane.com/

Commodore Events
http://www.commodoreevents.com/

Sausalito Waterfront Tours
http://www.apparition.com/

ADVENTURE CAT
http://www.adventurecat.com/

Blue and Gold Fleet
http://www.blueandgoldfleet.com/

Red and White Fleet
http://www.redandwhite.com/

• Walking Tours

San Francisco Historical Walking Tours
http://www.victorianwalk.com/

San Francisco City Guides
http://www.sfcityguides.org/

Footnotes Tours
http://www.footnotestour.com/

Federal Reserve Bank of San Francisco
http://www.frbsf.org/

• Recreation

Skydive San Francisco
http://www.skydivesanjose.com/

Bay Adventures
http://www.sfbayadventures.com/

Wale Watching Eco Tours 
http://www.sfbaywhalewatching.com/

Angel Island Tours
http://www.angelisland.com/

The San Francisco Tour Guide Guild
http://www.sftgg.org