If you check out the Diagram Group's Encyclopedia of Weapons, you'll find some nice illustrations of things like the shark-toothed sword/axes of the region.
OTOH, with the number of oversized critters in D&D, extra tough hides from dinos and extra thick turtle and mollusc shells would be more common. That would get you stuff equivalent to what you'd find in the Dark Sun setting. Check out Athas.org (http://athas.org/releases/) or that update Paizo did. Dragon Magazine #319 (the May 2004 issue) and Dungeon Magazine #110 provide an alternate interpretation of the setting for the revised Third Edition (3.5) Dungeons and Dragons game. (The rules for defiler wizards appear in Dragon #315, and additional monsters in Dungeon #111.)
For variety, Oriental Adventures has some armors that could be made in a Polynesian setting, such as Cord armor, which could be made with carefully woven creepers.
What about Sorcerers?
Some resources on ENWorld you might find useful:
Magical Tattoos:
http://www.enworld.org/showthread.php?t=195401
Water Spells:
http://www.enworld.org/showthread.php?t=191621
Critters:
http://www.enworld.org/showthread.php?t=185243
http://www.enworld.org/showthread.php?t=179818
http://www.enworld.org/showthread.php?t=179402
http://www.enworld.org/showthread.php?t=194546
4. Armor better than hide is nearly impossible to find, because metal is relatively rare.
OTOH, with the number of oversized critters in D&D, extra tough hides from dinos and extra thick turtle and mollusc shells would be more common. That would get you stuff equivalent to what you'd find in the Dark Sun setting. Check out Athas.org (http://athas.org/releases/) or that update Paizo did. Dragon Magazine #319 (the May 2004 issue) and Dungeon Magazine #110 provide an alternate interpretation of the setting for the revised Third Edition (3.5) Dungeons and Dragons game. (The rules for defiler wizards appear in Dragon #315, and additional monsters in Dungeon #111.)
For variety, Oriental Adventures has some armors that could be made in a Polynesian setting, such as Cord armor, which could be made with carefully woven creepers.
6. Spell-casters are druids and shamans, very few traditional wizards.
What about Sorcerers?
Some resources on ENWorld you might find useful:
Magical Tattoos:
http://www.enworld.org/showthread.php?t=195401
Water Spells:
http://www.enworld.org/showthread.php?t=191621
Critters:
http://www.enworld.org/showthread.php?t=185243
http://www.enworld.org/showthread.php?t=179818
http://www.enworld.org/showthread.php?t=179402
http://www.enworld.org/showthread.php?t=194546
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