Incredible flight over Kauai. Stunning views of the island, especially the canyon, coast and many, many waterfalls. I don't love flying or heights, and we went on a rainy day, so I was admittedly quite scared for a lot of the flight! But the pilot was very calm, relaxed, confident and knowledgeable and we were clearly very safe - just my own anxiety at play. The other passengers on my flight weren't at all concerned.
Advice: go on a sunny/calmer day (if possible!), and pay extra for the front row seats. You're already spending a lot of money on the flight, you may as well spend a little more to make your views MUCH better than they would be from the middle seats in row 2.