Well back when I was 74, I ran Drak'Tharon keep and I found a pretty neat exploit there where I floated out side the area and the mobs might have not been able to get me.
Doing this is pretty simple. When your on the overlook part close to the final boss, you can Wall jump over the fence and get behind it and float where the mobs can reach you! Its pretty simple, wall jump here:
http://i292.photobucket.com/albums/m.../walljump1.jpg
And you are over the fence!
Here is proof:
http://i292.photobucket.com/albums/m.../intheair2.jpg
http://i292.photobucket.com/albums/m...ntheair1-1.jpg
Have fun!