Amusing timing on this question, as I just got back from running two weeks of summer camp for a Boy Scout troop(*) I volunteer for. 60+ people, 15 days. I slept for about 20 hours when I got home Sunday night.
Backstory: A couple years ago, we took a hard look at the fact that we were taking 30 kids to camp each summer at the cost of $350+ a head, when we were spending less than that to run basic program the rest of the year. Scout camps are cheap compared to most other summer camps, but still, $350/person can buy a lot of camping if you spend it yourself instead of on some pre-packaged experience where you're mainly paying the stipends of camp counselors. So we decided we'd go somewhere fun (picked a river valley in the northeastern US with boating/rock climbing/biking/hiking options), and run about half the daily activities in in-house with adult volunteers (whom we can also pay for), and contract out the other half to a local guide service. Much better experience for the kids. We actually had kids break down in tears this year because they were anti-homesick (they didn't want to go home!)
Lots of people ask why I spend so much personal time and money on what (on the surface) amounts to a horrible vacation (chaotic, lack of sleep, busy all day). And it's true, if your ideal vacation is lying on a beach somewhere for a week, it's not for you. But frankly, "going to the beach" was every family trip since I can remember until I went away to college, and I just can't stand it anymore. When I go away on vacation, I want to do something other than bake in the sun every day and different from what I do in an office the rest of the year.
*(In case anyone asks: I find the most of the behavior of the BSA organization as a whole to be embarrassing/despicable, but most of the time we simply ignore them and they ignore us.)