I used the Go O'ahu card for this activity, and it was so easy to book. Our driver down to the bay was really nice and gave us a ton of information on the bay as well as the houses we were passing on the way there. If you want to see A LOT of fish and some sea turtles, you can't be afraid to go out deeper into the ocean. It's a bit difficult to get out past the rocks/coral without touching it, but totally worth it. I would gladly do it again in a heartbeat.