Great service. We took The Bus to Hanauma bay. All you have to do is call their system and ask how to get from where you are to where you want to be - they'll tell you the bus number, where the stop is, and the schedule of the bus.
The cost was $2 per person, to and from Hanauma Bay. No other place was going to beat that! Yes, it was a bit crowded, but we got to see the scenery on the way, and, frankly, it wasn't that long of a trip.
But, I can see how it would be tedious if you're getting to North Shore...