This cache is located a matter of feet from the main ferry landing site at Cuttyhunk Pier. Although it is a very short distance from where you will get off the boat, it may be best to save the cache for when there are few people milling about the area. Take note too that while Google maps may be showing the cache in the water, there is, in fact, a pier underneath the cache and it is not necessary to ge wet to make the find!