I'm in Dallas for a few days to attend a conference, and ended up with a bit of free time. I don't have a car, so it's tough to get very far from the hotel, but I did walk over to the 6th Floor Museum to check that out.
The museum is interesting mainly because you get to put yourself at the actual scene of the shooting, and see Oswald's point of view. The rest of the museum was interesting, with exhibits about the shooting, the immediate history afterwards, and some of the conversy surrounding the shooting, but it's nothing you haven't seen before on the History Channel.
The part of downtown that's within walking distance of the hotel rolls up the streets at night, so it's not a very interesting area for cuisine. We did take a cab the other night to a place called the "Cosmic Cafe", which is a Hare Krishna-esqe Indian restaurant. It's more like a funky hippy reinterpretation of Indian food, but it was good and pretty spicy. More interesting than eating at the hotel restaurant again, in any case.