Ko'Olina is a beautiful resort area with access to two pools and a lagoon, which was perfect for my niece and nephews. In the lagoon, we were able to do some "light" snorkeling.
There is a small shopping area, coffee shop, and restaurants within walking distance. Target and Costco are only 10-15 minutes away by car. I personally preferred staying in this quiet area and driving to some of the major sites (Waikiki, Pearl Harbor, etc.); without traffic, almost anything on the island can be reached within an hour.
The condo itself had all the necessary amenities, including laundry (soap included), beach towels, beach chairs, dishes, spices, kitchen appliances and more. The futon couch seemed to be a more comfortable alternative to a traditional sofa bed--used by my 9-year-old niece one night.
The lanai has a peek-a-boo view of the ocean and looks out toward Aulani over a field of grass. I would have preferred more lounge furniture on the lanai (currently there is one chaise lounge and a large glass dining table and chairs)--that's simply a personal preference based on how you plan to use the space. Bathrooms were spacious, clean, and nicely designed. My sister rented a different unit at Ko'Olina; the fixtures were the same, the only difference being the furniture and decor.
Each room is allotted 4 room keys that are required to get into the buildings and up to your specific floor--very secure, but made visiting my sister's condo a little challenging. There is a gym onsite, a lane for lap swimming in the "quiet" pool, and the staff is very friendly.
Wally, the owner, was very helpful and accommodating when it came to changing our reservation, which I greatly appreciated.
Overall, we all enjoyed our stay with all of the available amenities and excursions. Ko'Olina is a great place for families--including aunts (or uncles) who sometimes wander down to the tiki bar or lie by the pool with a book. =)