They've done most of the usual places - from the Gold Dust, to Thirsty Bear, to The View at the Marriott, etc, etc. They're not too keen on touristy-places, of course, so things like Stinking Rose and such are right out.
Popster and visiting pal are both v. smart and fairly urbane. Pop lives in SoMA, so he's worked that area over quite thoroughly. I was thinking about something on the other side of Market street, maybe...?