I think Shake Shack is a pretty good joint when craving for fast food that doesn't seem so much like "fast food". I know a lot of people talk about this place being pricey and that In-N-Out has better burgers, but all in all, Shake Shack is not all bad.
I don't crave for burgers that much, but their veggie (portobello mushroom) burger is really good. That and their cheese fries are the main reasons why my fam and I come here. Sometimes it seems like they don't put enough cheese on the fries, but I'm pretty sure you can request for extra. I don't see why not.
One of their specialties is the frozen custard ice-cream called a Concrete. I highly recommend this menu item if nothing else seems to be striking out to you.
They have a lil menu for dogs too if you happen to bring the furry friend along. My dog taste tested all the treats and loves them!
If you're in the area, give this place a try. Plus you can go shopping right after since this restaurant is located in Downtown Summerlin!