Yeah, have fun while you are there!
Remember don't do anything to the turtles, you can't touch them or do anything that will even alter their swim path.
The corals in Hawaii are not very good and are kind of endangered, you can't touch those either (same with the rocks).
When loooking at the garden eels make sure to watch your air, you get carried away looking at them and go deeper and deeper and you forget about air :lol
If you do any snorkeling go out to Sand Island and Shark's Cove, both are nice places.
Be sure to check out The W and Waimea Park before you leave.
Plenums and ultra deep sand beds > all other setups!