Regarding food at the little shopping right next to MKO:
This is a tiny strip mall where Disney has their DVC office on the upper floor. There is a trolley that leaves from MKO every hour. It stops at Roy's, the strip mall, and the Marriott hotel. The mall is really an easy 8 minute walk from MKO, though. It's directly across the street from Aulani.
There is a Hawaiian BBQ place that in my opinion is better than L&L. VERY inexpensive. If you have kids, eat here! A kid's burger is under $2. Stay away from the slushies - they are much better across the street.
The Mexican restaurant is not bad, but not particularly great. Prices are much better than MKO. I usually order a carnitas burrito - hard to go wrong there. Tacos - which is supposed to be their specialty - are not very good. They do have a great selection of unusual margaritas at a reasonable price. I enjoy the watermelon one in particular. The restaurant is definitely worth a try, and it grows on you. Very lively atmosphere.
Across the street is a "country store" style ABC store. Same ABC prices and same ABC stock - it's clearly an ABC when you walk in. (GREAT musubi!!)
The ice cream parlor is a great big meh.... Quite expensive for the quality, but there's not many great ice cream places in HI. If I went to a nice looking shop like this on the mainland, I'd expect incredible ice cream. The chocolate and mint-chip flavors I tried were very bland. They seemed to have a very low cream content, more like ice milk than ice cream. They were struggling when we went, and I don't give them a long life expectancy.
When we went last year, a couple of places had yet to open.
Be sure to get a discount card from MKO!!! You get 10% off the already unbeatable prices at the Hawaiian BBQ. On one trip to the ABC, they gave me 10% off even though they weren't supposed to. Always wave the card - sometimes magic will happen. Mexican restaurant does not give any discount.