I am booked for a 6 night vacation in SF beginning this Friday. What is different in this post from most "I'm coming to SF and want to know where to eat" posts is that I intend to dine with my wife and 13 year old son. He has good manners and a pretty good palate. We already have booked reservations at Chez Panisse and Bouchon for our trips outside the city (and some culinary archtype discussions...) but I'm interested in ways to expand has taste experiences without being too staid for the young guy. BTW his 13th birthday is Saturday. We'll be staying in the Union Square area and I'd like to have a meal or two close by. Hopefully some of the hounds on this list with teenage boys can direct me to a few of the "cool" places.