museum etc.
i'm with dhuey in recommending the excellent museum - and there are a ton of good (really good) restaurants in the international terminal (i understand tho that sometimes you want to get away from the crowd into a lounge, esp. if you get reimbursed) - if your timing worked, the virgin lounge would have been a great one
like everyone else who's been there, i find the UA lounge a real embarrassment (embarrassing for UA, and for SFO, for San Francisco, and for the entire USA! but i think our foreign visitors learn very quickly that there are pitifully few really good lounges in our great nation)
i guess we'd be interested to know what your solution was when you flew out last month?