We stayed at Kahana Nui for Christmas week in 2014. There were four families with kids. It was an amazing experience. The house is peaceful, right on the ocean, and large enough for 14 people to hang out without tripping over one another. The view and the serenity are unparalleled (and remember, this was Christmas week when the Islands are just overrun). We ate most of our meals in, and the kitchen accommodated us without problem. The beach is a little rocky, but if you walk down the street two houses there is a beautiful (and empty) sandy beach. There's a lovely little pool in the back with an attached hot tub. WiFi was fast and reliable.
We rented paddle boards from "Alex" at Maui Stand Up Paddle Rentals (http://www.mauisuprental.com), which we highly recommend. Launch right from the back door into the protected bay there. Alex and his crew deliver and pick up the boards for free and give you the necessary instruction (it's not hard).
An excellent experience. You won't go wrong.