My parents and grandmother just decided to come to DC this weekend, and I'm trying to figure out where to take them Saturday night. I'd like it to be something that has sort of an "only in DC" feel. Old Ebbitt Grill was going to be my back-up if I couldn't figure out something more interesting, but it looks like they're booked so I'm starting from scratch. They're not terribly particular, and they have pretty simple taste, but I want to take them someplace they'll really enjoy. Dad's a pretty casual guy and will want someplace not too fancy or expensive. Mom is easygoing but would love some healthy, interesting choices. And grandma would probably appreciate someplace semi-quiet, food she can recognize, and easy & safe parking or Metro access. Someplace near a cool DC landmark would be great. Any suggestions would be greatly appreciated.