Despite speculation, you do not need the Splitpaw Adventure Pack to zone in, although it does use the same graphics and zone layout.
Full of level 47 through 50 heroics. All with a pretty decent amount of hit points each.
Kill all of the mobs before engaging the king. Because if you don't (even at level 70) all of the remaining mobs will come and attack you when the king gets to 50% health. *To engage the king, click on the bowl full of food at the base of his bed.