I understand the islands are also overrun with longpig,er, people, too.
Kauai is not so overrun with people, depending on where you are. There are still lots of places where you can disappear and never be heard from again. The mud and muck of indeterminate depth in the Alakai Swamp, for example.
Another few things Kauai is overrun with are mango trees, passionfruit trees, and papaya trees. Stand in one place too long and you'll get brained with a big fat ripe mango or coconut at certain times of the year.