This cache will take you to a structure located in the NW corner of D.W. Field Park. In fact, this part of the park is so far up it's actually in Avon and not Brockton! There is a small pull-off near the cache to park, but keep in mind the road around here is a one-way.
Note: There is some broken glass near the cache, so please be careful. It is not necessary to get that close to it to find the cache.