There have been a number of posts requesting Thanksgiving dinner in the city. The new Bon Appetit has an "Eating out on Thanksgiving" column. Mentioned in SF is Americano Restaurant in the new Hotel Vitale. Chef Arenstam will be serving prosciutto wrapped polenta with sage, Dungeness crab with a watercress dip, roasted Petaluma turkey with prune and Armagnac gravy and Hog Island oyster and fennel-sausage stuffing.
So, sounds like a great meal.