HollywoodMole has a point. If they wanted to, a camper could just slip off during a hiking trip.
As for the cabins, my suggestion would be having four cabins available, four campers and one counselor to a cabin. We could split the cabins up by gender (two boy cabins and two girl cabins) or have two boys and two girls in each cabin. The counselors would be responsible for the four kids in their cabin, and they can take their cabin to do a couple of camp activities each day. For example, Cabin A might go canoeing with Cabin B in the morning, and then do an arts and crafts project with Cabin C in the afternoon.
That's just an idea, feel free to modify it as you see fit. ^^ Also, we could work in some kind of "Campfire Group Therapy" thing each day, where they all sit in a circle and roast marshmallows while talking about their feelings and past experiences.