It's been almost 5 yrs since we were in Aulani so please take the suggestion with that in mind. Although we are planning to go back next year and it appears they've added a few things.
As a pp mentioned, we were never bored while we were there even without the nightlife. I will admit that we were exhausted by about 10pm so we just usually took a leisure walk on the paths.
We stayed there for 2 weeks and out of those, we only left Oahu for 5 days to visit North shore, Pearl Harbour, Honolulu/Waikiki and all the tourist spots. It was absolutely beautiful just driving around.
We enjoyed the lazy river, over and over again, and the beach and we even took a catamaran tour off the beach through Aulani's activity centre. We saw quite a few sea turtles and it's absolutely amazing to see Aulani from that perspective. And the sunsets were absolutely spectacular...Boy, I guess you can tell I miss it. We didn't even have time to be bored.
At the resort, we did go to the show two nights and went over to see shows (luau) at the resorts nearby. Aulani didn't have an actual luau at the time, so we went other places. We even did an indoor luau (which we thoroughly enjoyed and loved the table service upgrade as well as the tables close to the stage) near Waikiki.
But our favourite places to dine near Aulani was Monkeypod and Roy's. Monkeypod was a surprise, it seemed very casual but the food was very good. We dined at Aulani's Ama Ama and Makahiki which were both good.
The only restaurant that I felt we had that was authentic was this little place near North Shore, but I can't recall the name of it.