A Patronus is a complicated charm that is used to repel dementors and lethifolds. It can also be used to send messages, although only members of the Order of the Phoenix are known to have done this. A well cast patronus will have the corporeal form of an animal which is related to the personality and desires of the caster. In the rare case that a witch or wizard is an animagus, it will take the same form as the animal in which they can transform. 
You will need to climb Bill Back Butte. Our route was FR 230 to 230A, then drove as far as we could and hiked the rest of the way up. The Coconino Forest has closed the trail to the top to all motorized vehicles: please respect this by hiking or apparating only. Depending on your route and parking area, plan 1-1.5 miles round trip. I recommend taking the spoiler photos with you as the trees and rocks make the coordinates less precise than I would like.
This is a letterbox hybrid. In addition to the normal logbook and trade items, it also contains a letterbox stamp, inkpad, and stamp book. Please do not remove the stamp, ink pad, or stamp book. THEY ARE NOT TRADE ITEMS! I recommend you look carefully at the stamp, as it is a clue to an upcoming cache.