Part of the Balloch Trail, but slightly off the trail.
This cache is in a quieter part of the park. Easiest way to find the start of the path, is to either start from "#3 Balloch Trail: Top Of the Trail" and follow the higher trail, back in the direction of the castle, or from "#1 Balloch Trail: Log the Fairy Door" continue away from the car park till you reach the single lane, then follow the marked trail from their (approximate waypoint added).
The cache is slightly off the trail, just shy of 6ft up a tree (no tree climbing required).