Stay in Fort Worth... Dallas sucks. Hit up Joe T Garcias mexican food in Fort Worth. The Patio is the size of a football field, and the Margaritas are incredibly strong. Has a really great atmosphere. West 7th street is the new place to be at night in Fort Worth. I have been in Dallas for the last year so don't know the names of the great bars over in that area. I keep hearing a place called Capital Bar is a great time.
If you choose to stay in Dallas, then uptown is the place to go out. I live right here in Victory Park next door to the American Airlines centers. TONS of beautiful women on McKinney Avenue at all times, but a bunch of douche bags also.