I'm hoping that the structure is that you can explore all of the "regions" at any time that each have one or more main dungeon(s), as well as their own unique NPCs and minigames and minidungeons in them that you can find on your own. Once you have the ability/items/know-how to get to the dungeon itself, there begins some kind of pre-dungeon quest that leads up to that, where you can leave at any time and resume later if you want to go do something else.
I'm hoping the structure is not:
[enter Castle Town]
Townsperson suddenly craning their neck towards you: WELL I GOTTA SAY, I can't get my goods to Goron City anymore after those fiendish Bokoblins set up on their outposts on the Western Road!
QUEST INVOLUNTARILY ACCEPTED: Destroy Bokoblin outposts [0/4]
[destroys 4 Bokoblin outposts]
TSCTNTY: I heard about what you did, adventurer! I'm already raking in the Rupees so fast, I sure wouldn't mind sparing some for the hero that saved my business!
[100 Rupees received]