On another note are you staying at a hotel or renting a house. When we went we rented and had about the same number of people and it was awesome. Our own pool and tons of room. we were a block from the beach and on the same block as the place Obama rented when he was there. That was cool.
This is the place. A little tacky furniture but otherwise awesome.
http://oahu.bluekailuavacationrental...hiatthale.html
http://www.google.ca/search?aq=f&gcx...+house+rentals