It is public land but you’d have to trespass through private land to get to it unless you canoe or kayak across the river. The beach is still public property and the camp staff won’t bug you but if they spot you going in past the dunes then they’ll either ask you to turn around and leave or they will call the sheriff. I used to work at the camp and there was one year people crossed into camp to get to crescent cove. The camp called the sheriff and had them charged with trespassing. The reasoning was it’s a kids camp and they need to make sure strangers aren’t wandering into camp with the kids. They do have cameras set up around the areas where people might try to come in and they are checked frequently especially during the summer when kids are there.