There are a few I really enjoy and although I've seen them several times, will often turn on and watch when I need some brain candy:
Here are some shorties that I have enjoyed:
I can think of others, but can't find the links.
Here's another good one:
And of course, Dad is right on with Deliverance. Dunno why I didn't think of it.
I'd recommend avoiding "Deliverance", and also "The Great Outdoors" LOL.
@SILHiker I almost suggested the Great Outdoors, too. Lol
Not really sure these will appeal to the age group but..
Jessica Mills' (aka "Dixie" aka "Homemade Wanderlust") PCT 2017 hike film.
180 degrees south
The Endless Summer
@OldGuyot - 180° South has come across my radar but I have not watched it. You liked it?
I worked with young kids and the main thing was (IMHO) getting them to understand that they dont have to look and live like they are in a dystopian apocalypse when they go camping. Make camp meals, and let them try them. Once they realize that they wont be sucking on last years granola their minds open up.
Take them through some jump drills for skiing. Hold your feet together and jump over an imaginary 2x4 keeping separation from the upper and lower body.
Bring a kayak in and a bunch of paddles. Show paddling technique, then sit them down in a chair with their feet on another chair and have them hold the paddle correctly and push with the obliques. Use another kid to anchor each chair.
Bring in a tent or two. Set them up. Show the gear, add deodorant, I dont care if you embrace the funk, you havent been with a pack of pre turning pubescent males w/o a shower. It is of extreme importance to the ecosystem that young men use deodorant. The stink will put a buzzard off a gut pile.
You can do some cool stuff like make a fire with a ferro rod. I have a pretty good write up I did with my daughter and son. After training, I took the scouts into my woods and sat on a cooler that had hot dogs in it. When they made fire, they got to cook over it. When asked what would happen if they didnt make fire, I told them they would go hungry. They all made fire.
Keep the films short, they watch screens all of the time. Try to get them a taste of what can be.