Welcome to Birch Grove Park
Park is only open during the day so no night time caching unless you want to speak to the local law enforcement.
The posted coodinates should have you in front of a sign, attached to a tree, warning people to not handle wild animals. Good advice when you are hiking in the woods.
If there is a squirrel on the sign, the cache is at N 39 20.245 W 74 32.880
If there is a rabbit on the sign, the cache is at N 39 22.646 W 74 33.280
If there is a cardinal on the sign, the cache is at N 39 21.598 W 74 33.530
If there is a raccoon on the sign, the cache is at N 39 22.485 W 74 33.876
If there is a porcupine on the sign, the cache is at N 39 21.936 W 74 31.046
Cellular coverage is not the best here in the park. You are looking for a green bison tube hanging in a holly tree. If you need more help, check the hint.