I first visited SF as a Yahoo! intern (my first time in CA) and it was quite an experience. I didn't know anyone except for an online friend or two at the time

I first visited SF as a Yahoo! intern (my first time in CA) and it was quite an experience. I didn't know anyone except for an online friend or two at the time but just driving down the 101 and seeing the HQ of big companies was inspiring. I say just go! Follow all the techie SF-based hackers on Twitter and you'll find some event to go to during your stay.