Within the Presidio, there are a few restaurants; but I've never been to any of them. To the South and West, on Clement, there's a bunch of Chinese places (in "Chinatown 3.0") -- some of them quite good, like the Buddhist Vegetarian Bok Choy Garden. To the South and East, at around Divisadero and Page, there's the Little Chihuaha, a very reasonably priced, good quality Mexican place -- sustainable ingredients, not too much cheese, no more than ten dollars a person.