Restaurants with a respectable happy hour usually get a 1-star bump and the HH at Kona Grill is one of the best in town. The menu here features dishes with pacific rim influences and an excellent sushi bar. The food is above average for a chain restaurant and service has always been on point.
What brings me in to Kona is their happy hour. Every night til closing, KF offers a wide array of sushi rolls, appetizers, flatbreads pizzas, and of course drinks and great prices. The sliders, and BBQ chicken flatbread are my personal favorites. The sake bombs come with a large bottle of Kirin beer and a bottle of warm sake. Easily 3-4 drinks and a steal at $8. Happy Hour is only available on the massive patio and a few select tables inside by the bar. Though there are heaters, make sure you dress appropriately if you plan on dining on the patio.
As one the best late night spots in Summerlin, Kona is definitely worth checking out.