WARNING: If you are uncomfortable in wet, dark, constrained places for extended periods of time... what are you doing Geocaching? :-) Seriously, bring a flashlight with an extra set of batteries and be careful when doing this one. Going during or after rain is not recommended, but in any case you shouldn't have to get wet.
It's 1966 . Your name is Andy Dufresne [Marky]. You've served 19  years in Shawshank Prison [Los Gatos High School] for a killing your wife [trespassing], a crime you didn't [ ? ] commit.
Start at N37 13.487 W121 58.582.
While serving your time, doing the guards' taxes [taking tests], you've also been working on your escape plan. Day by day over twenty years you've slowly dug a tunnel that will get you out.
On this stormy night [sunny afternoon], you attach a bag of supplies to your leg [back], and crawl through the tunnel you dug in the the wall. You exit into a large maintenance room [drainage hole].
Go through the tunnel to N37 13.413 W121 58.489 and stop under the grate. Note the number in grafitti on the wall.
You crawl 500 yards [feet] through a sewage [drainage] tunnel to freedom [getting a job].
Exit out the tunnel the way you came in.
A year later... Your name is Red [Joani]. You've just been released from Shawshank Prison [Los Gatos High School] on parole [passed finals]. You remember a conversation you had with Andy [Marky] before he escaped:
"I'll tell you how it is, Red [Joani]. There's a big [small] hayfield [trail] in the town of Buxton [Los Gatos]. You know where Buxton [Los Gatos] is at, don't you?"
"It lies right next door to Scarborough [Campbell]."
"That's right. And at the north end [west side] of this particular hayfield [trail] there's a rock wall [metal fence], right out of a Robert Frost poem [ ? ]. And somewhere along the base [a few feet away] of that wall [fence] is a rock that has no business in a Maine [California] hayfield [trail]. It's a piece of volcanic glass, and until 1947 it was a paperweight on my office desk. My friend Jim [Boulter] put it in [near] that wall [fence]. There's a key [ammo box with a log book] underneath it. The key [log book] opens a safe deposit box in the Portland branch of the Casco Bank [allows you to log a find on Geocaching.com]."
Using the numbers you found in the tunnel as XYZ, go to N37 13.4 (3+Z) (Y+1), W121 58.(X+Y) (5+Y) (Y).
"You follow your compass [GPSr] to the rock wall [metal fence] in the hayfield [trail] near the big oak tree and find a tin lunch box [ammo box] under a rock. Inside is $1,000 [some change if you're lucky] and a letter [geocaching notice]."
Thanks to Marky and Joani for making this cache possible! Inside are some nice items contributed by Marky. Have fun and be safe!