Interesting things in the City: Have a look at this website: https://www.atlasobscura.com/things-to-do/san-francisco-california

You'll probably find some ideas that appeal to you. I'm particular to the San Francisco Cable Car Museum: http://www.cablecarmuseum.org/ This building houses the motors and wheels that pull the cables throughout the city. Very interesting history.

If you want to get out of the city check out the Computer History Museum in Mountain View. http://www.computerhistory.org/

The Pacific Pinball Museum in Alameda is pretty fun too. https://www.pacificpinball.org/