Quoted By:
Seconding the Pacific as a good source for unique wildlife. Also Madagascar.
Another place with people: North Sentinel Island - near India where natives basically live in the stone age and violently refuse any attempt at contact by the outside world. Although I guess not a whole lot of info exists on them.
So, maybe it would be better to check out the Korowai from Indonesia / Papua New Guinea. Until they were contacted by anthropologists in the 70s they didn't even know other people existed. They build some sick fuckin tree houses