Check out The Ayleid Steps. 100's of new 'step stones' scattered around Cyrodiil that transport you, semi randomly to different locations, including some new dungeons. There's a shortish quest to activatye the steps, plus further quests (that I've never done), but once activated the steps are a lot of fun.
I will second that. This is another really great mod. It fully supports OblivionXP which is my current leveling mod. So does Kragenir's Death Quest.