I would like to purchase a $150 gift certificate for my friends, a husband and wife who let my wife and me stay at their place for four days during a recent visit to San Francisco. Unfortunately, I don't know much if anything about their culinary preferences. They are in their early 30s and live in the Marina district. I'd like a restaurant that is interesting and exciting, not an old-school place. But it should still be nice enough that it's some place they wouldn't otherwise go to without a $150 gift certificate (which need not cover the entire meal, but get them close to it). Nothing too experimental or overly one-dimensional, since I don't know their particular preferences. It doesn't have to be close to where they live, though it should probably be within a reasonable driving distance. I don't know enough about the city's dining scene to know where to start. Any suggestions? Thanks!