I really, REALLY want to see what whiterun was like in the 2nd era, and also Winterhold in its better days, but I was thinking and there is also other places I'd love to see.
I'd love to see Taneth and that part of Hammerfel, I'd love for them to finally complete the Elsweyr map(I mean, I think we have had more content in the AD area than anywhere else, if we go by the map of main tamriel)
Then I would also love to go back to the Shivering Isles(But methinks that will be a few years in the future to do some sort of small nostalgia appleal to the Oblivion Remake lol) and there are also some other daedric planes we have not seen, or we have seen as micro areas in missions but not had as a place to be able to visit per se.
I'd say my priority would be the whiterun area, seconded by the Taneth area
I mean, if we are talking realistically, I would go Akavir, which they said they will leave mysterious and untouched, so I don't think I would ever see that in my life
Then Pyandonea, which considering how the Sea Elves are portrayed, would make no sense to have being accessible as would break lore and immersion
Maybe being able to explore the frozen continent or maybe a few mid sized Yokudan islands that were left untouched by the calamity(With the ending having some sort of "hush hush" pact to never reveal that they are there nor their location, ofc. but I digress, they will never actually do any of these areas, so this one is wishful thinking
What areas are you really, really looking forward to discover(if they don't keep giving us islands that they make up from scratch lol)