Moss Room. Anyone been lately?
Their squash blossoms, on the appetizer menu, are fantastic. One sees this dish around town a lot, but rarely have I had it prepared better. I also had what I think was a special - fresh sardines - that blew me away. I was at Aqua for dinner the next week and I can say unequivocally that the seafood was prepared with greater ingenuity, verve and freshness at the Moss Room. I can't wait to go back.
My one input regarding seating is that, for an intimate birthday dinner, you may want to request a table away from the bar area. It can get a little noisy there on busy nights with a younger crowd (I think a lot of UCSF students out for a swanky cocktail night - they have a great specialty cocktail list...)
Do request one of the tables near the moss wall/fish pond with your reservation, and if you enjoy offbeat and excellent wines, do ask to speak to the sommelier, who has put together an excellent wine list (related to the Slanted Door list). We had a very good meal there; on a price adjusted basis it isn't the most competitive, but it's hard to put an exact price on location and support for the arts. The menu changes regularly, so it's hard to recommend anything, but there's a definite focus on fish.