This Lander, Wyoming-based outdoors school primarily serves the school-aged -- teaching teenagers and college kids about leadership, nature and survival in the wilderness in courses that can run as long as a full semester. But it's less well-known that NOLS also offers classes for adults, which typically run a couple of weeks.
I joined one of their programs in the Wyoming Wind River Mountains almost exactly three years ago, and as a decidedly non-outdoorsy New Yorker, I will never forget it. In fact, I count it among the hardest things I've ever done -- but, since I didn't have to be helicoptered out I counted it as a raging success. (I hardly ever discuss how, on the last night, I took an instructor aside and said, you know, I've just realized that my people aren't woods people.)
I learned a lot about how you live a day-to-night life in the back country, for example, how to not freak out when crossing streams by jumping from rock-to-rock with a heavy pack on one's back, and how to keep hiking with two sprained ankles. Glamping this is not, but if you want to end the summer with a sense of pride and accomplishment, a NOLS course might be just the ticket.