1. Go to the orange circle on the map (hardly noticeable, so coords are: 57.5, 87.4)
2. Position yourself like so on your epic mount.
3. Epic wall jump forwards.
4. 100% speed jump (after you dismount, QUICKLY wall jump forwards to land like so)
5. Jump / walk up.
6. Find the tree! (very hard to miss)
7. Position yourself like so.
8. Wall jump forwards once.
9. Again.
10. Turn to your left, and wall jump forwards.
11. You should have landed like this:
12. Jump up / walk up.
13. Phew, it's over!
14. Explore or noggenfogger float down!
NOTE: I am sick of people saying "WTF IS THIS RLLY 2.4.2, WALL JUMPING IS BROKEN THO? It has been greatly nerfed, but it is still possible to wall jump in some places (like this one). This discovery is only possible because of the 100% speed jump.