Beijing's Summer Palace is a magnificent place to spend a day, and its restored halls, gardens, and walkways are easily one of China's more interesting sites.
Nearby, but much less visited, is the Old Summer Palace. It was looted and pillaged by European troops during the Opium Wars (as was the 'main' summer palace), but unlike its neighbor, it was left in a forlorn state of ruin as a reminder of the destruction. One of the few things rebuilt, however, was a neat stone labyrinth that winds its way towards a cupola in the middle.
To claim this cache, you'll have to join the clusters of visiting Chinese tourists and navigate the labyrinth yourself. Find your way through the maze to the listed coordinates, and then log your find with a picture (with your GPS visible) that clearly shows you made it there - either showing your feet or from such an angle that it's obvious where you are. (In other words, no trickery with telephoto lenses.) And no credit for climbing over the walls, either. Don't forget how to get back out!
Other Chinese caches by ooga booga
Haerbin, Stalin Style
A-maze-ing Old Summer Palace
West Lake - Three Pagodas
West Lake - Mid Lake Pavilion
It's a Bird! It's a Plane!
Hsien Ku Fung (Hong Kong)
Mad Dogs and Englishmen (Hong Kong)
Macau's Second - Coloane's Highest (Macau)
Green Lotus Peak, Yangshuo