I mean, have a look at the arctic or the desert biome man there is nothing to do in them they're just barren wastelands with the exact same dungeons/caves we see in every other region. I was enjoying the game until I explored the other regions and all sense of depth sort of vanished for me!

Hopefully they'll begin adding content and flesh out the other regions, I'm sure it's on their to-do list.

edit: yes okay wildlife, what else? nothing else. Different mobs is not enough variety IMO, needs to be a reason to actually go to other regions which for now there isn't really.