If you've read Swallows and Amazons, by Arthur Ransome, then you know what I'm talking about.
If you haven't, you should.
I just discovered that a movie was made in 1974. Watching it now and it's quite entertaining, so far.
I think it's a splendid idea, personally. Too many people have forgotten what it's like to be a child. You have to be able to have a little freedom and test yourself.