"I always like going South, somehow it feels like going downhill" - Treebeard

Disclaimer - I don't actually know if you're going south, but it is downhill!

Head down the Southern Pass. There's some really tall trees here, like mahoooooosive. When you get the driveway on your right, look up. Then look further up. 

How did Pumbaa get up there?! This is the next password.