You will need to follow the trail near the Pheasant House at Carpenter's Brook Fish Hatchery. This spot is a county park and, therefore, has its open hours, which can be obtained from its web site.
The cache is a cache within a cache so when, opening the top, please be very careful since it is pretty delicate. Also please return it to its proper domicile.
There is a present in it for FTF!
Congratulations to Cosmonium for FTF!