What are some nerdy/geeky things to do / places to visit in San Francisco?

I am visiting there for the first time from the Sept 30 to Oct 5, if that helps for maybe any events or anything of any interest. I don't have a ton of money but I'll spend a little bit if it's something awesome. Any help would be fantastic. Thanks!What are some nerdy/geeky things to do / places to visit in San Francisco?
Others have given you some good ideas here are few more



The Randall Museum a small natural history museum above the castro.



The Cartoon Art Museum the only museum dedicated to the preservation and promotion of graphic arts.



The SF History room on the 6th Floor of the Main Public Library at 8th and Market.What are some nerdy/geeky things to do / places to visit in San Francisco?
The Exploratorium is pretty nerdy/geeky.What are some nerdy/geeky things to do / places to visit in San Francisco?
Academy of Sciences



Every 3rd Wednesday - FREE

9:30am-5pm

Golden Gate Park Music Concourse

415.321.8000



Asian Art Museum



Every 1st Sunday - FREE10am-5pm

Civic Center Plaza at Larkin %26amp; McAllister

415.581.3500



Cable Car Barn %26amp; Museum



Every Day - FREE

10am-6pm

Take ANY cable car to Washington %26amp; Mason

415.474.1887



Exploritorium



Every 1st Wednesday - FREE

10am-5pm

Palace of Fine Arts at Lyon %26amp; Marina

415.563.7337







Legion of Honor/De Young Museum



Every 1st Tuesday - FREE

9:30am-5pm

Legion of Honor, Lincoln Park/De Young, Golden Gate Park

415.750.3600



Museum of Modern Art



Every 1st Tuesday - FREE

11am-5:45pm

3rd St between Mission %26amp; Howard

415.357.4000



Yerba Buena Center



Every 1st Tuesday - FREE

11am-5pm

Mission St %26amp; 3rd near the Mosconi Center

415.978.2787



Friday Night at the De Young



Fridays in March-November - FREE

5pm-8:45pm

Music

Golden Gate Park at Tea Garden Drive %26amp; JFK

415.750.3600What are some nerdy/geeky things to do / places to visit in San Francisco?
The Audium "sound sculptured space."

http://www.audium.org/



Camera obscura near the Cliff House:

http://www.giantcamera.com/



The merry-go-round at Yerba Buena Center.

http://www.yerbabuenagardens.com/

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