Re: Oahu Mamas!
A friend of mine just gave birth at Castle Hospital in Kailua. According to her, they have a 'jacuzzi' (which sounds to me almost like a birthing pool) and probably is your best shot at a very natural birth. I'm not sure who her doctor was though.
I gave birth at Queen's in Honolulu. No tubs, nothing. They do, however, encourage you to walk everywhere when you're in the beginning stages of labor!