Please park at the parking lot coordinates and then proceed south on Province road. The trailhead will be on your right and you will see a closed gate with a sign asking for people to check in at the main office. You can ignore this sign since you'll be on foot. Permission from the camp owners has been explicitly granted for people to come down this trail to retrieve the caches. They just ask you be respectful of the property is all. There are many younger children finding these caches, so feel free to place appropriate loot within the caches for them!
This cache is one that was actually setup long ago by the camp for internal use - they are now making it publicly accessible. If facing the beach head with the dock, you turn around 180 and you'll see a smaller trail (it is seldom travelled, so it may be hard to see). if you go down that and go a little up the hill, you should spot it, even from afar. There's a little sign marking it as well.