Hey jbear, I spent 10 days on Oahu a few years back and was in the water for 8 of them. We went through Island Divers Hawaii and booked two tank dives each morning. We got a package so I think it was a pretty good deal. We saw most of the major sites off the south shore: YO257, Sea Tiger, Corsair, Turtle Canyons and a few other smaller reefs. They booked the individual charters and just told us where to go each morning. Take a look, I’ve got some of the photos up. I havent done Maui, but hear its even better diving. Have fun, and don’t forget to breathe!