TwoIf - my girls have been on cub and scout camps and have had a wonderful time. They are not bossy and if they were they'd be pulled up on it pretty quickly. The boys (and girls) all muck in and are allowed to be who they want to be.
Dh goes on all camps hail rain or shine as well and gives up tons of his time, so I think many other children benefit from his input too.
I just don't buy into the idea that boys are being horribly curtailed by girls being there. They know boys can be boisterous and that's fine. My girls don't mind it or expect it any other way, nor do any of other girls there afaik.
How much more boisterous would they be without the girls there? Not any more than they are now. Or do people want 'boisterous' to be taken to such a level that their boys are permitted to run riot and hurt themselves and each other in the process and no-one says anything or stops it because 'that's how boys are..' 
There has to be a point at which boisterous goes too far and spoils it for eveyone, even with between just boys. That fact has to be observed in any group. Blaming girls for being there and spoiling all the fun is not the case.
Btw I also have a son, so I know what makes boys tick too. I have never heard him or any boys complain about the girls presence there. It's a place where everyone has the chance to try all sorts of great activities, take a few (monitored) risks, learn to get along and have fun. If it helps boys and girls see each other as people rather than defined only by their sex then that's a good thing surely.