One of my best friends met his now 30+ years wife at one, they were counselors.
I remember they got Thursday evenings only where they could do what they want (but couldn't leave), so I'd get a call Thursday morning with The List of Needs, and we'd meet in the parking lot after dark. Usually about 15 counselors, and maybe 1 or 2 of us coming up to hang out and party.
Beer (just enough to drink all of it)
Weed (that they could keep and sneak off to abide daily)
Assorted 1st world stuff like soda, munchies, shampoo, deodorant, tampons (lots of 18ish year old gals that were counselors)...that kind of thing.
And hey, the ladies there had needs, and a few of them were quite fetching. Get 'em tipsy, take one down by the river, and get busy - skinny dipping was pretty much standard every time. Fun summer for me, got laid every Thursday, and I never worked a single minute there.