Thanks guys. I have just been checking out Niihau and it looks awesome. Don't know if I can spare the whole day though, as my wife is a non diver. :-(
My wife is a non-diver as well. She got dinner at Roy's after a spa day as an incentive to let me go.
Too bad about timing, stay in touch with them when you're there if you can swing the short notice trip! Well worth it.