I don't know if you need any perception. You'll just need to get a bird's eye view of the area to see where the trail goes. (I'm not sure if it's a puzzle or not, so I'm trying to be vague right now.)

Gretchen

Meeting Nilandia: http://gsguide.wikia.com/wiki/Nilandia
Nilandia's GS4 Info Repository: http://www.nilandia.com
AIM: Lady Nilandia