Middle Earth. Its got the Shire, Rivendell, Minas Tirith, The Great Dwarf cities, Lorien, Argonath, Isengard, and even Mordor be a really cool place to visit. Plus the landscape is likely much more beautiful.
Really in Westeros, the only thing I would really want to see and go well out of my way to see is the Wall, and maybe Oldtown and the Eyrie. If you added Essos, I would want to go see much more over there and would make it more of a match. The Titan of Braavos, Vaes Dothrak, Volantis, Meereen and its great pyramids, Quarth seems like it'd be incredible, and then Asshai for the mere novelty.
This post was edited on 5/10 at 1:41 pm