Shake Shack in DT Summerlin is a great lunch/dinner spot. The prices are a little high, but the food is great. You order before choosing whether to sit inside/outside. It gets pretty packed on the weekends, but on the weekdays it's a very relaxing lunch experience. The chicken is wonderful and I definitely recommend it. The cheese fries are also great, and I usually share them with my lunch date. Prepare to spend a little more than your typical burger joint.