Spoiler Alert! We have some more information about how to perform this quest but recognize you might want to try it on your own before we tell you the secret...
Take the left-hand fork from Vargo, then as you go up the hill leave the path to the right and go to the right-side of the ruins there. Through the "window" you will see Akko Spiderhead. It is safe to jump through the window but go no further unless you want to fight 3 mobs!