What to do in Dallas for 3 hours?

I have a lay over at Dallas airport for about 4 1/2 hours. Is there anything I can do there in three hours that would be worth the drive. Is the airport even close to the center of the city, where it wouldn't be a hassle to leave the airport? Does the city have a subway system or would I have to take a taxi?... show more I have a lay over at Dallas airport for about 4 1/2 hours. Is there anything I can do there in three hours that would be worth the drive. Is the airport even close to the center of the city, where it wouldn't be a hassle to leave the airport? Does the city have a subway system or would I have to take a taxi? Are there any good restaurants in the area where we can grab lunch at least. I would like to do something that is unique to Dallas.
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