Hey guys, here I am, contributing. Right, so basically start here:
then Wall-jump here:
then wall-jump further, here:
Then go here:
Then jump on the wall, be sure you land on this thing:
Walk over here and aim towards the bank on your mini-map whilst mounted:
JUMP! And hope for the best, if you've done it properly you should now be here:
Congratulations on the exploring :-) Have fun!