Aside from meeting hackers, simply walking around the city will be interesting if you've never been there before. Just don't go too far from where you're stayi

Aside from meeting hackers, simply walking around the city will be interesting if you've never been there before. Just don't go too far from where you're staying unless you plan it in advance. Areas in San Francisco go from nice to seedy very quickly. Granted, it isn't like going into South Central LA, but it's still bad.