Mrs. Gee was the school librarian, keeper of quiet and queen of overdue book fines. Among the hottest titles flying off the shelves (and occasionally under desks) were the I Spy books by Walter Wick. At some point—possibly during a caffeine-fueled burst of inspiration—Mrs. Gee created a real-life I Spy board for the students. Only later did she realize it would double as an excellent geocache... mostly because kids are really good at finding things when candy or bragging rights are involved. Somewhere on the board are the three sneaky little digits you'll need to crack open the cache container. Happy spying! (Photo in Gallery)