Going to the store with kids is hard. Taking them to the beach is really hard, but moving across the ocean to Hawaii with them is one of the hardest things a human can do. For kids, uncertainty makes them act up in a move. Their normal environment is gone, and they don't comprehend the future the way adults do. They can't understand total change because they haven't seen it before.
I have 3 kids, so I know how hard and how rewarding it is to be a parent. If you're moving to Hawaii with your kids, I'm the real estate agent that knows how to make it easier for your kids!