Don't let the fact you don't know anyone in Hawaii prevent you from making your move. We moved here without knowing a soul, and we know other people who have done the same thing, so it is possible. Part of the reason we moved here was the quality of life, and it sounds like that may be an issue for you, too.
I know of a family that moved here, bought some land, and set up a tent to live while they made money to build a house. That's one extreme. A decent house on some land might be around $275,000. East Hawaii certainly has the most affordable housing in the islands. Unemployment is at 2.8%. If you or your husband have a business or would like to start one, you couldn't find a better place to relocate.
I know families that either home school their kids, send their kids to private school, or send their kids to public schools. The advantages of each are probably the same no matter where you live.
If you haven't been to Hawaii before I would recommend a trip to see if this place is for you. Things move much slower in Hawaii. The cost of living is higher. We don't have the variety of stores available here that you will find in Honolulu.
Everything has its advantages and disadvantages. You need to carefully weigh the impact moving here will have on your lives. If the good outweighs the bad, then your shouldn't hesitate in moving here. It's a great place to live.