The face of the mountain
Welcome to a band of cliffs I know as Hyperion Cliffs, named after one of Saturn's moons for their unusual unearthly appearance. They sit upon the slopes of Howard Mountain, though I have heard of this landmass being called Facer Mountain. I wonder if this face in the rock is where that name came from, or just the Facer family in the area. Either way, the face in the rock is the crowning beauty of this cliff band. It is possible to scramble up or down to the cache location, but I strongly recommend rappelling equipment.
The approach
This geocache is placed with BLM permission. Access is best via Trail Creek and hiking over, though GarriLyn has granted permission for hikers and geocachers to pass through her farm over the gates at the Abraszewski trail head, provided we keep the gates closed so livestock doesn't escape. You can also access by parking near Simplot and crossing the railway. See the Waypoints portion for more info on access.
Reaching the face
As you can tell from the background, this is a crazy slice of landscape with thousands of hiding spots and a lot of potential hazard reaching them. The picture above shows the rock corridor the cache is hidden within. There is this displayed upper entrance to the south west of the posted coordinates and a lower opening beneath and to the south. Though it is possible to scramble in from either direction with some determination, I recommend bringing rappelling gear. Anchor to the rock stacks in the bottom left of the image above and rappel down the corridor to the cache and then you can keep rappelling out the lower opening to the south. It makes for a nice fluid continuous rappel where you're always protected against a fall. The anchor can be built out of rope running around the stacks of rock or a nearby tree. You shouldn't need any trad gear, just make sure your anchor is redundant, as always.
What is letterboxing?
This letterbox cache functions just like a traditional cache, but there is also a letterbox stamp and ink pad inside to stamp your own book. Please bring your own letterbox stamp if you have one to sign the log. If not, some people just use their fingerprint as their unique stamp along with their name and the date. Make sure to leave the stamp, ink pad, and logbook inside the container.