Let's say, roughly where Hawaii is OTL, there was an island about the size of Hispanola, Cuba, or something in between, and natural resources at similar levels*: Polynesians still arrive, form a mostly isolated society (as OTL) until the arrival of James Cook in 1778.
What kind of potential does this open up? For example, could a Kingdom of Hawaii become a serious power player with those kind of resources? Could it unleash a rush for outright conquest?
*with native crops, obviously