Does anyone recommend anything in Dallas?
What kinds of stuff are you interested in, and how long are you in town?
Arrive on a Monday, fly out on Friday.
Things to see (evenings), maybe some good shopping, especially restaurants.
"Things to see" is kinda vague, but I'll try.
There's Dealey plaza, you can go see the Grassy Knoll, the Sixth-Floor Museum, which used to be the Texas Schoolbook Repository, where Oswald shot Kennedy from (if you aren't a conspiracy theorist - if you are and thus don't believe the Oswald story, I refer you again to the Grassy Knoll, though really, it's not very impressive); it's now a museum about, essentially, the Kennedy assassination. There's a Holocaust museum you could look up. The SMU campus has Bush 43's Presidential Library. If you're into art, there's the Dallas Museum of Art and the Nasher Sculpture Garden. There's an Opera house whose name escapes me at the moment. Dallas Symphony Orchestra plays at the Meyerson. There are several little theaters around, though I don't really know any to recommend. I guess the one I heard about most recently was the Wylie theater which is supposed to have some kind of interesting/progressive stuff, but that's just from what I hear. There's a Natural Sciences and history museum named after Ross Perot, which I've only heard good things about (though I wasn't very impressed with it - I think it's because I have my degree in Physics, so get annoyed at their oversimplifications; it's intended for children, but I hear most adults like it). Shopping I don't know a lot about, but I think the 'it' place to shop is the Galleria. Or maybe now it's the Shops at Willow Bend, though that's a little ways north.
Restaurants, I know there are a lot, but I've never eaten out tons, and when I do, I usually don't spend all that much. The one recommendation I could make, assuming you are happy spending a fair amount, would be Bob's Steak and Chophouse. Get something with a glazed carrot - surprisingly good. iirc, entrees are kind of $40-60 there, which is really above my price range. If you want to go REALLY high-end, the super expensive place is supposed to be Three Forks. There's also supposed to be a good Wolfgang Puck Restaurant at the top of Reunion Tower, but again, I've never been there.
If you're looking for more Texas-y things to do, and don't mind going a little ways, you can head to Fort Worth, where you can go see the Stockyards, or Sundance Square. You can also go to the Mesquite Championship Rodeo (probably that's not all year-round?), which is the rodeo you'd want to see, if you want to see a rodeo.
Dallas and Fort Worth both have zoos. Dallas Zoo has supposedly gotten a bunch better recently, but Ft Worth Zoo is better - and very good. Along those lines, you could go see the Dallas World Aquarium, which honestly I'd probably prefer to either zoo.
That's all I've got off the top of my head, I'm sure there's more.
Most of all, dress clothes for a variety of climes - weather flips 40+ degrees Fahrenheit within a 24 hour time span REGULARLY. Well, unless you're coming mid-summer. Then it will just be hot, no question.