Have sleeping bag races. Use mess kits to eat cake. Create a safe fire with a fake flame by using rocks, logs, and cellophane in yellow, orange, and red. Use graham crackers and chocolate bars, then use marshmallow fluff for the marshmallow that are flame toasted. Retreat to tents for telling secrets or ghost stories and playing hide and seek.
Fishing is a real treat.
Foam fish in a big plastic tub and the magic of magnets. Cut fish and fishhook shape out of craft foam. Glue 2 magnet eyes to each fish and a magnet to each hook. Hole punch the top of each hook. Tie one end of a string to a hook and the other to a dowel that will act as a fishing rod.