Increasingly, adults can now go to summer camp, too — and their options for activities are sometimes a lot stranger zombie hunting, anyone? There are about summer camps that either exclusively cater to adults or offer some kind of adult programming in the U. Roughly half of all of these adult camps are focused on adventure, including water activities like canoeing, kayaking and fishing, as well as downhill skiing. Here are seven of the craziest summer camps for adults:. The acre CannaCamp near Durango, Colo.