Must See/Do in San Francisco?

I thought it would be cute to include with this post, a photo from my first trip to SF. It was early summer 2006. Ha. No. Looked at photos earlier this evening and it was funny seeing this early version of myself. The friends I went with and myself--we look like such creeps! Thriftstore clothes, weird shoes, hanging out in alleys, digging for records, picking up flyers, long walks through bad neighborhoods, talking my way past bouncers, younger, thinner. Really though, I just don't feel like doing any scanning right now.

Can't find any photos of my 2nd trip the following year. It is possible there are film rolls buried somewhere that never got developed.

I like San Francisco. Both times I've been, the weather is just the way I like it (clear and a bit on the chilly side) and the city's odd characters find me and talk away some crazy gibberish at me and they end up hanging out for awhile. All kinds of people: yuppies sipping Nescafes, Chinese punk rocker, garage rock heroine, homeless people.

Been thinking about this because I'm headed up again. This will be my 3rd visit. Much older now--not a teenager--but my interests are mostly the same. My traveling companion and I are interested in shopping for records, books, thrifting. Going for 2 nights. Besides that, suggestions for other things to cram into the schedule? I'll take your restaurant and lounge recommendations as well.