I haven't tried 'Ohana. This is mainly because my impression is that families sit together and they bring you skewers. This could be entirely wrong, but it's put us off!
Kona, on the other hand, is definitely one of our favourite restaurants. I love the coconut chicken with the almonds etc, and also the terriyaki strip steak. I prefer when they had the banana-caramel creme brulee, but the chocolate-banana one is fine too. They also have very good service, usually quick and polite. It can get chilly though so take a sweater.