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The Hobbit or There and Back Again Chapter 5 - Riddles in the Dark
Bilbo wakes up in absolute darkness and can't see what's around him. While searching for a way out he finds something and puts it in his pocket before moving forward. He meet Gollum by an underground lake; a nasty creature. Bilbo and Gollum make a deal that Bilbo will be shown a way out if he can answer riddles, and if he can't, Gollum will eat him. They ask each other riddles until Bilbo asks "What do I have in my pocket?" and Gollum doesn't know the answer; and still wants to eat Bilbo. Bilbo reaches into his pocket and the item he found before is a ring. He puts it on and it makes him invisible. Gollum thinking Bilbo is escaping, runs to the exit, so Bilbo follows him invisibly and escapes past guards by wearing his ring.
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BRING WATER, energy foods, sunscreen, bug spray, wear a hat, and good hiking boots, shorts not recommended (path may be overgrown depending on time of year.) NOT RECOMMENDED FOR SMALL CHILDREN, due to steep slopes and sharp drop offs. Also remember your surroundings, rattle snakes, bears, and cougars may be in the area.
All 19 Chapters will take about 4-6 hours to complete (slow and steady hiking). The hike is a very steady and steep incline, you will be hiking 1632 feet uphill, and is 10 km's including return.
Please see https://coord.info/GC3GJK6 for instructions on the runes you can solve while doing this cache series to find the finale. THIS RUNE HINT is 4 feet up on a nearby tree. 
Congrats to thefamousthree on your FTF.