San Francisco things to do?

I am going there in about two weeks from the 19th to the 25th and I am wondering what there is to do. I am alone by myself, so I mean it should be something I can do solitarily unfortunately, but I mean maybe I'll meet someone while I'm there, who know! :D

So just some ideas, praticularly if they are free etc. That would be awesome. Thanks!



Also forgot to say I am staying at the San Mateo Marriott so anything near there would be great.San Francisco things to do?
In fransico u can do anything, u should try their food places great, and they have a lot of fun things to do. a lot of rides (kinda)San Francisco things to do?
The Golden Gate Bridge, Alcatraz, Fisherman's Wharf, Muir Woods, or you could take a day trip tour thing out to Yosemite...