As a scout leader, I teach my troop quite a lot ( and some of the parents). Most love it. Recently we did a 'fire lighting without matches' evening. We had them using my bow drill and other things like a brillo pad and a battery. Most made smoke with the bow drill as they are quite small but one lad did it. The look on his face was a joy to behold.
Children love making camps and dens and fudging about in the woods. It's what children do. i don't think we need to worry if a gaggle of crazy beavers bash the hell out of a load of stingers. take the stingers and show them how to make some string. I did this at a cub camp and they spent ages making nettle cordage and rubbing dock leaves on their legs and hands.
Michael, my 13 year old, is now coming along nicely. I got him a GB pocket/mini axe for christmas (Woodlore were doing them cheap) which he adores, and I've passed him down a frosts training knife, which he has learnt to sharpen very well indeed.
So far he's had the odd nick when using the knife, the axe he is very careful with and so far has only dinged his knickles on the chopping block!
He now wants to do some training, but being a big 13 year old he is in a sort of limbo where he is mentally and physically able to do a lot of the things he wants to, but a lot of the schools have a minimum age of 18 for doing anything involving cutting (insurance I imagine). So its now down to me to pass on what I can, as soon as I feel competent to teach him.
At least it gives us some quality outdoors time together.
we used to teach knife craft as well but so many parents were worried and complained that there child might turn in to a maniac (thanks to the press) that we had to unfortunately stop doing that.