The Flight of Fancy mystery is found west of Okonhsa:ke in Vinland. This mystery must be completed in order to unlock the Breaking Teeth, Not Hearts mystery.
Lead the Turkey
When you approach the mystery marker you’ll find a woman shouting from atop a cliff near the river. Speaking to her will reveal that her pet turkey has flown down the cliff and cannot fly back up. Your task is to head down the cliff and lead the bird back up along the side of the cliff until you reach the woman. You’ll want to head to the left and hug the side of the cliff as you climb up a hill with the turkey in pursuit. Every so often the turkey will try to attack you, you’ll want to just run up ahead until its calmed down and then return to it after its calmed down.
Once you’ve brought the turkey back to its owner speak to the woman to complete the quest.