This is the first of a series of caches along the Chisholm Trail, a foot and cycle path connecting various parts of Cambridge, including Fen Ditton, the River Cam and Perne Road. Phase 1 of the trail was only recently completed in November 2020, with the second and final phase not being completed yet. The trail is a lovely route, including great views of the River Cam, but can get quite busy especially on sunny days. For several of the caches, I have included an image with an arrow pointing towards the direction to walk or look to arrive at the cache relatively quickly.
The first cache is the least accessible from the main path. It requires arriving at GZ (around 20 meters off the path), and then squeezing through this tree archway to get to the clearing with the cache in it: