Greetings!
Indeed, make the tribal people of the Isle of Dread Polynesian-like people. Make some faction of them savages, cannibals, thorough villains, and make another faction that are of Good alignment, and potential allies for the Player Characters. Embrace tribes of monstrous humanoids, lots of dinosaurs, giant insects, and various weird monsters!
Add in some ancient ruins, a few demonologists and bands of evil reptilian humanoids, too. There's also some room for a few rival bands of evil adventurers as well.
Fantastic environment!
Semper Fidelis,
SHARK