Send in the heavy equipment and crush everything.
What island of Hawaii are you speaking of? The big Island had Hippies moving into the jungle to live, way back, saved their unemployment checks to get one way tickets to Hawaii and head on in, build huts and make trinkets to sell to the tourists.
Oahu has the large Pallie that can support a few hundred homeless, but as it is a military island, not such a good place to take up house keeping.
A Loooong time since I lived there, what have people done to those beautiful islands ?