There are a lot of great places in and around Aulani/Oahu.
After doing a lot of research (this included asking our friends who had lived there) before our trip last August the places we tried and really liked were:
-Sam Choy (was excellent for fine dining)
-Giovannis shrimp truck on the north shore...garlic shrimp!!
-Matsumotos Shaved ice- North Shore
-malasadas: Leonards bakery- really good
must have when in Hawaii! (there are a few locations-all listed on their website- but the closest one to Aulani was a food truck/trailer in a strip mall parking lot right off the freeway about 10 minutes from Aulani)
-Hula Grill -
http://www.hulagrillwaikiki.com
-Roys at the Ko Olina Golf Course
And if you want to drive into Kapolei (5 mins from Aulani)
-Aloha Salads was super yummy and fresh
At Aulani we really loved Ama Ama - went there 2x's -we would go for a late lunch ( I think the last seating was around 2:30 so it felt like dinner to us those first few days) because the lunch menu appealed to us and also because the prices for the dinner menu seemed to be less of a value for what you get.
A few times we got lunch from the poolside waiters... the menu did not have much variety but we were a captive audience and the food was good.
We were not so impressed with the resorts dinner buffet at Makahiki (sp?).
--The places that were recommended to us but we never got a chance to go (there is always next time
) were:
-Zippys in Kapolei
-Azure -- in the Royal Hawaiian
-Kua Aina(burger place) in Haleiwa (north shore)
-Koa Pancake House- Kapolei
..supposed to be really good
-Hanks Haut Dogs- was on the food network Diners Drive Ins and Dives
-Cinnamons-- where a friend of mine had the best birthday breakfast red velvet pancakes!!
-Morimoto Waikiki -
http://morimotowaikiki.com/ (Chef Morimoto from Iron Chef)
-Dukes -
http://www.dukeswaikiki.com/ has great breakfast and lunch; more casual! Nice place to grab a beer and sit outside and enjoy the ocean!!
For Hole-in-the-wall for local food: Rainbow Drive-In (pretty famous), Diamond Head Grill & Market, Sidestreet Cafe