I'd go back to Morrowind, but I don't think I'd care for revisiting Cyrodiil. There wasn't anything very interesting about it, really.
Generic medieval-fantasy setting with very small variation in climate or terrain. All of the cities were basically similar - a walled hamlet with a dozen buildings, a church, and a palace with a Count of Countess in it. Very similar architecture. The Imperial City itself was bland, a lot smaller than it should've been,
That's because in Morrowind you couldn't see beyond the mist 10 feet in front of you and you couldn't run fast.
But mostly because fast travel was limited, and mostly confined to the West of the island, with sea transport around its circumference. This meant that a lot of the island's interior, and eastern portions were accessible only by foot. And with the rough terrain (mountains, mushrooms, rocks everywhere) you often had to take circuitous route to get somewhere if you didn't have a reliable and fast levitate spell. And besides, I'd rather have mist shrouding the distance in mystery, as opposed to Oblivion where I could look and see White Gold Tower from virtually anywhere in Cyrodiil.