Survival and knowledge nature would be obvious.
I’m a little concerned that he will lose the boyscout aspect in being a ranger though. There’s almost too much overlap. An investigator may be a better fit. Boy Scouts are big on knowledge and preparation.
Not sure if good is even necessary. It always felt more lawful than good to me.
Edit: just checked and there is a natural philosopher archetype for the investigator in ultimate wilderness that fits this concept pretty well.
You have to define what that means to you.
Is it someone who could live/survive off the land indefinitely?
Is it someone who lives a mostly urban (or suburban) life but enjoys occasional wilderness forays and has respectable skills in that setting?
Is it someone who goes glamping once a year?
Any of the above could fit a concept of 'boy scout' from the perspective of their wilderness skills and abilities. Obviously, they are rather different.
And that is just one simple aspect of a what a boy scout could be.