Man, the Isle of Dorn is so pretty. There's a video up on Meisio's YouTube channel which shows the island with ambient nature sounds in the background.
If you're chilling on one of those mountains, you can really see the sea all around you. Proper feeling of being on an island out at sea, for once. Coupled with the fact that horizons in WoW look better these days...
The island itself is so cleverly designed for this type of expansion, as well. A large, clearly visible blue sky without a bunch of clutter. That's really helpful when players need a break from the caves below. Everything looks really crisp and pleasant as well.