You know you can just use google or yelp
Here are some articles from that very google search listing some of the top local dallas restaurants:
when you find some restaurants that pop out for you go ahead and write them down on a piece of paper and then make sure to ALSO look them up on yelp (have one browser tab for the article and another browser tab on yelp) so you can see if
1. the ambiance is nice in the photos
2. the vibe is more food oriented and less alcohol oriented
3. what the price range looks like
Off the cuff, I can tell you that this place - Velvet Tacos - looks pretty cool
I just recommend that you have one or two other things planned for your sweet sixteen, like an early pool party, mid afternoon tacos, then a group movie or bowling. Movies being released May 2018 include Avengers Infinity War, Star Wars Han Solo, Slenderman, Life of the party - it's a pg-13 adult? comedy, and a new Laika stop motion film) 1 unique group activity to try would be an "Escape Room" you could also see if there's any cool music artists coming to town that month.