The Badaling part of Chángchéng, the Great Wall, is from Beijing easily accessable in one or 1,5 hours by public bus or train.
If you want to find the cache (size is between small and regular and has enough space for Travel Bugs) please use the waypoints. You need at least 30 minutes from W1 to the cache. The part on the Great Wall is quite steep. The following trail, starting at W2 is fairly small and slippery in wet conditions and gets thorny on the last 10m.
Please do not try to find this cache in the snow because your footprints will lead the local muggles to the hiding place.
Have fun and don't forget the spoiler pictures!