Get scuba certified
before you go. As beautiful as the islands are, the most beautiful and breathtaking parts are under the water.
If you end up in Kona, go on a night dive with
Jack's Diving Locker and swim with the giant manta rays, it something you will never forget in your life.
Getting scuba certified before you go saves you from wasting your time and money while you're on vacation taking a sub-par resort course.