A friend just emailed some suggestions what to do while stuck in SF:
20+ campfires on Ocean Beach
A fun thing to do any Friday or Saturday night after about 8pm until after midnight is go to Ocean Beach where hundreds of people make 20+ campfires (folks are friendly -- just walk up and introduce yourself and join some group's campfire or walk between many -- bring some beer or snacks to share if you want to). This beach is at the intersection of Great Highway and Fulton street, San Francisco https://maps.yahoo.com...
Apparently, SF is more European than US on average, since you also have:
San Fran nude beach
If nude beaches are your thing, the weather looks nice and warm this weekend, so try Baker Beach in San Fran (don't go if you are homophobic). near the intersection of Kobbe Ave. and Lincoln Blvd., San Francisco: https://maps.yahoo.com/#mvt=m&lat=37.79878...
I appreciate, and will consider the suggestions! (There was also a bunch of restaurants, museums...)