I wish I could rave about this underwater adventure like so many of the reviews I've read, but the experience was underwhelming. While under water, I saw at most 3 difference types of fish, no turtles except the ones swimming close to the water's surface at the beginning (probably because they were trying to get away from us interrupting their peace!), and no octopus like the one shown in the pictures. Unless you're snorkeling too, be prepared to wait around--a lot. And if you do snorkel, the underwater current might knock you around and make you nauseous so you might not be in the water too long.
Honestly I wish I could get my money back and use that toward zip-lining or other adventure instead. I chose this adventure because I can't swim but I wanted to experience the ocean while in Hawaii. PRO: The crew member that helped me board my scooter was awesome and super supportive.
The crew helped photograph our experience, but I never got to see those pictures even though they took my email address.
If you DO decide to go, here are some TIPS:
1) You'll probably want to empty your bladder before you board. Luckily Island Water Sports does have a bathroom. To get to it, walk passed the boat in back and keep walking till you see stairs on the left and the bathroom will be up those stairs on the left.
2) Get there early 30 minutes before departure if you want to be the first to get on the scooters. You'll want to be the first group so you can see the most marine life before they get scared away by the subsequent groups. Although the one positive in being among the last to go is you don't have to wait around shivering after you get out of the water.
3) They have large shared dry compartment to keep your belongings from getting wet. Keep your phone or camera out to take pics while you wait around till it's your turn to board the scooter.
4) Bring your own towel.
5) scooter BOARDING tip: When you dive down to get into your scooter, pinch your nose or hold your breath so water doesn't get in.
6) IMPORTANT: While underwater, every so often pinch your nose and blow out your ears at the same to equalize pressure. Otherwise it can feel uncomfortable.
I understand everyone's experience is different which is why there are so many excellent reviews on here. So don't let me discourage you from having a good time snorkeling and scooter diving if that's what you're into. For the money I paid though, I just expected a richer experience than being submerged in a fish tank. You might have better luck and see more marine life though. Good luck and enjoy!