Please look at the first cache in the series, #1 The Locked Gate, for a full description and a map of the route.
Please:
Stick to the footpaths
Bring your own pen
Sign the logs
Re-seal and Replace caches carefully
These three sentinels guard the cache as they stand proud on the plain.
To get to cache #4 carry on along the path until you come to a point where a footpath appears on your right leading into the woods. Take this path.