You can levitate from one island to the next (assuming good framerate and not too much lag). But only in one direction (downhill) Rivervale -> Everfrost -> Faydark -> Dreadlands; you cannot levitate the other way. You can do this without having completed any of the quests to travel between islands.
On the last island is Al'Kabor himself, talking to him will allow you to port back to Rivervale; you don't appear to have to do any of the quests for him to do this.
So it is possible to travel around this zone if you haven't done the quests; but can be mildly inconvenient (having to go all the way to the end in order to go back an island).
Edited, Oct 16th 2012 12:36pm by Umbraeques













