From the Wild Duck Pond 2nd parking lot, follow the "Pathway" north into the wood. The Saddle River will be flowing to your right. A very short walk on the path, you will see the sand. The Cache is close by. Enjoy the park, the beach, the playground, and of course, the dog run. Also, this is technically where the Saddle River Bike Path begins, so you can follow this all the way down to Saddle Brook NJ. Several miles.