This comment got my skull exploding with ideas for a different approach to this park:
DISNEY'S LOST WORLDS
"Guests are explorers departing on research expeditions to discover mythic lost civilizations throughout the world, with each "Lost World" being a place where myths live in harmony with nature."
Think this approach could preserve a lot of the nature, myth and culture we've been discussing, but in a more directed and exciting way. Like DAK, animal exhibits line the ruins and make the settings feel lived-in. Lots of worldwide settings are still represented, but in a less "edutaining" way.
The entry land could be a
base camp in a remote village where we leave on our adventure. Makes guests the center of the story, as
@MonorailRed suggested. Full of artifacts already recovered. Other lands could include:
El Dorado - Latin American
Shangri-La - Asian
Camelot - European
Asgard - different European
Atlantis and/or
Lemuria - Atlantic and Pacific set respectively, which could allow for Greek, Polynesian, even Caribbean
Dhofar - Arabian lost city in the sands
Solomon's Mines - African
Antarctica - Following the dinosaur valley / Lovecraftian ruins examples
This is a list which can be whittled down. It's just an example of the theme's breadth. And I'd wager IPs like
Coco could still fold into an El Dorado setting easily enough.
This proposal is a big move away from what we've been discussing, but discuss it or reject it as you please.
Aaaand while I was writing this,
@Pionmycake said something very similar!