The north end of the Big Island of Hawaii is the birthplace of the warlord king of the island, Kamehameha.
The very northeastern section has the deepest valleys, highest waterfalls, and fewest roads. Even with a boat it would be somewhat difficult. I have never taken a helicopter ride for fun and have never had the desire to spend that kind of money, but this would be a place to do it. Just how much are we willing to pay to see something which may be forgotten in the haze of our declining years?
The road out of Kona takes you north ...