This is in the Judy Blume Rest Area of the Garden State Parkway. Judy Blume is a famous New Jersey author who has written many books for children, young adults and adults. She has been given many awards and honors and has also sometimes been banned due to her frankness in dealing with certain topics. As a child, I definitely knew where the "Blume" books were in my own school and town libraries.
To get coordinates, do the nearby Adventure Lab entitied "Rest with Judy Blume" using the Adventure Lab app. You will be granted the coordinates to the final location after answering the stage "In the Unlikely Event."
Maybe you will be inspired to try one of her audiobooks as you continue on your travels!