Bonus photo-op view - Hyde & Lombard Street - (top of the twisty street) you can catch a snap of a cresting cablecar set against a great view of Alcatraz. If there arent too many gawkers in the way - might want to go to the next street lower on hyde to get the pic.
It's a start - I was in SF with my brother while he recovered from surgery so I had a some time to wander about. I didn't get into SOMA to check out some zine shops and stuff so I'm hoping others will fill in any gaps of geeky stops. Oh most Chinese food in Chinatown is overrated, shops are ok. And definitely put the Computer Museum on your list.
If you like museums, the California Academy of Sciences in Golden Gate Park is a great place to spend a day. It's also right by the De Young Art Museum, which is also a lot of fun. If you're looking for something more interactive, check out the Exploratorium. It's slightly geared towards younger audiences, but it's a lot of fun regardless.
Maybe the tech shop in SF too. Go on meetup.com as there are always tons of events/talks on different topics. Search for your preferred language, platform, db, etc. Amazon Aws pop-up loft often has events.
Electonics Surplus Shops - HSC Electronic Supply, Weird Stuff, (there are others others)
Pacific Pinball Museum in Alameda - http://pacificpinball.org/
Musee Mechanique at Pier 45 in San Francisco - http://museemecaniquesf.com/ great collection of old arcade games and nickelodeons
Exploratorium Pier 15 - http://www.exploratorium.edu/
San Francisco Cablecar Museum , free enjoyable and an adventure to find - http://www.cablecarmuseum.org/
Bonus photo-op view - Hyde & Lombard Street - (top of the twisty street) you can catch a snap of a cresting cablecar set against a great view of Alcatraz. If there arent too many gawkers in the way - might want to go to the next street lower on hyde to get the pic.
Cartoon Art Museum - http://cartoonart.org
Some great Japanese (toys, Manga, food, Books, etc.) shops in Japan town in SF (Geary & Filmore)
Collect old magazines? The Magazine in the Ternderloin (kinda seedy but if you are into collecting old mags a place to check)
San Francisco Public Library - besides the massive computer section, a library card will get you access to their e-books when not in SF
Check out SV book stores their computer sections are usually well stocked and up-to-date
Makerspaces (someone post suggestions)
Ripley's Odditorium at fisherman's wharf - kinda pricey but fun if you like weird - dont buy the maze pass, it's a rip-off.
Walk the Golden Gate Bridge - up close and personal with a great engineering marvel for the cost of a city bus to get there.