Facing the original entrance, you need to go left.
You should come into an alley like so. There's going to be 2 ways you can go at the end of the alley. You need to go right until you hit a hill of blocks/ruins.
X is where you need to be. Make sure you're mounted to get up there.
Distmount. Now just walk foward. Doesn't work too well with taurens. So go cat form.
No, this is not a joke. The whole time there was a giant smiley face under Kara.
Just go foward into the green and you're in!
For those of you who still can't get it....
http://www.youtube.com/watch?v=kuqurYzZDQs