Jade forest for sure, I'm sad I actually look forward to questing there due to how visually stunning it is.
Closely followed by valley of four winds and kunlai.
Not a fan of wilds too many instant agro points and far too many trees.
Dread wastes is ok but love it for the story not the look.
Jade tho if I fancy some timeout I go find one of them lone tiny houses and just go fish outside it