The StoneCutters
The posted coordinates are for a huge boulder in a parking area close to the actual location of the cache.
The Stonecutters were a fictional secret society featured on the Simpsons. At work, Homer notices that Lenny and Carl are acting strangely. So he follows them after work to a foreboding temple where they join a strange ceremony with Moe, Chief Wiggum, and other men of Springfield. Homer finds out they are members of an exclusive society called The Stonecutters. He also discovers that Grampa is a member, which guarantees Homer's membership. He participates in the induction ceremony, and is inducted by the leader, Number One.
After Homer joins The Stonecutters, he becomes admired and popular. But when he uses the sacred parchment as a table napkin he is stripped of his membership. Then, when Number One is kicking out the now naked Homer, he notices a unique birthmark on Homer's back. The birthmark identifies Homer as The Stonecutters' true leader!
The members celebrate that The Chosen One, Homer, has arrived. Homer is very excited, at first, with his new status. But he quickly becomes bored with how the other members fulfill his every wish. Homer consults Lisa, who suggests he use his power to better the community. The Stonecutters reject Homer and his new idea, and they form a new society called the Ancient Mystic Society of No Homers.
To find the cache you must first decode the instructions on the piece of sacred parchment above. The cache is a small camoflaged container hidden in a tree.