Ask HN: I'm in the Bay Area, now what?

I just came to the Bay Area (Cupertino to be exact), to meet with some potential clients for my startup. Things have gone great so far. But I need some advice on where I can run into a more startupy crowd, where I can look into maybe getting some working (coworking) space etc.

I'll be commuting between Florida and here, so where should I look for housing (right now it's the Essex Hotel, which is great but I don't feel in the midst of it all).

Look forward to some advice from fellow HNers who have set up shop here!