After exiting Druid's Overlook, Justiciar Thommis will stand right in front of you. After speaking with him follow the path along the valley to the north to speak with House Ranger Amon (you should already see him from there). Further to the northwest, along the same track you'll find House Ranger Lanalt. Then turn northeast, and follow the path away from the valley. Turn east, cross the bridge over the valley. That's where you find House Ranger Rionel. Continue along this path and you'll get to The Wilds, where you'll find Witness Giselle. Note: The last part of the path has some nasty pop-up surprises in store for you, such as a pack of the poisonous Maguuma Spiders. Throughout the jungle you should stop short of foes you see just in case there are pop ups in front of them.