leonard17f,
I have just got back from a trip to the USA where I got delayed for two days in Dallas (DFW).
We spent the day in central Dallas and weren't impressed. The city seems geared up for car travel and there wasn't much to do and see on foot. If you are staying near DFW you can get the train ($5 return from DFW) into Dallas but it doesn't run very late.
A local recommended going to Fort Worth (same train line but opposite direction) instead of Dallas as it was friendlier and more tourist/traveller friendly.
FNW