I was a camp counselor for 5 summers... don't let those boys rock your boat. Yes, there may be resistance but it isn't anything you can't get through.
You have some awesome stuff lined up, you have put a lot of thought and effort into planning all the projects. Just remember to have fun with your job and the campers will to.
And don't be too afraid of those teen boys... talk to them and show a little interest in what they are doing, I think a lot of times they act that way because they worry that they won't be good at crafts or whatever. But I think you have done a really great job choosing things that they could easily do things that suit their own tastes.
If you make examples of your projects maybe make some in colors or themes they may be interested in.
Don't worry too much they are really not too terrible, sometimes the ones I thought were going to be a pain in my butt were really awesome kids
Good luck I am sure you will do great
p.s. if you have leftover time... do the origami, they will love it. extra bonus points for you if you let the older boys (girls too) choose the ones they want to do and look out of your book or photocopies