Don’t know what you would be interested in seeing. But Fort Worth is only about 40 miles or so from Dallas thus in effect you are in one huge Metroplex. Here are a few links to things you maybe interested in. In addition a 2 to 3 hours drive will get you out to many interesting places.
http://www.fortworth.com/visitors/
http://www.discoverdfw.com/attractions.htm
http://www.thedallaspage.com/