I'll be doing likewise Duncan,
My plans are to hopefully spend a day or two at some start-up somewhere pairing with somebody on something and hopefully learning something (if anybody is interested in having me let me know)
Apart from that, I can recommend hanging out at wine bars, more wine bars, wine bars and more wine bars - that might just be me, where to stay is a matter of taste but SF is full of cheap hostels and motels and given that you'll spend most of your time out it's not worth spending on a real hotel ;)
If you want to hang out at some point during the week, I'm up for it, if Nodejitsu want to organise another evening of trampoline dodgeball perhaps....
Rob