Ok, so, go to the lake (the big one) and look for a large rock shaped like abraham lincoln's hat. When you see it, take exactly 47 paces NNW and brush away the sand to reveal a trap door.
Go down the trap door and descend 50 feet until you enter a hallway marked "Lab 7." Walk down the hallway until you hear loud rave music. If you hear polka you've gone too far. Take the nearest right and a man will be standing in the hallway. Ask him who charlie is, and whatever his reponse is, tell him "Pepperoni has 37." He will unlock the door.
Continue down the next hallway until you reach what appears to be an atrium filled wih zombies. Its OK though, they only want to eat your flesh.
If you survive the zombies, take a right then a left then another right and you will notice a ladder. Use the ladder to reach a ceiling grate. Open it, crawl 200 meters through the ducts, and eventually you will drop into the lake. Swim to the shore and you will see something. I cannot say what, that is for you to see. When you see it, you will know you have arrived. Godspeed.