Best places to go in Fort Worth, if you haven't been is the Stockyards, and Billy Bob's, then head to the Fort Worth Zoo (possible non-compliant 30.06 sign there though) but it still is one of the best zoo's in the nation. Also go see the Kimbell museum, and all the museums actually (the natural science and history museum is building a new building so it's in with the cowgirl museum iirc) you also need to eat at Joe T. Garcia's, and if it's on a saturday or sunday see if there's a gun show at Will Rodgers. Downtown is alright, worth going to see if you have time, the things I listed first though are the main FW attractions.
So main things I would see:
Stockyards then Billy Bob's at night
Zoo and Museums then Joe T's at night
But that's probably more than a day and a half's sight seeing, but we do have some good stuff for visitors, great museums and zoo and cultural things that Dallas really doesn't have (it's because were better
)