To paraphrase a popular quote, 80% of success in scouting is showing up. Show up early to meetings. Go to outings and events. Attend summer camp. When the time is right, try and go to Jamboree, or a high adventure base. Enroll in NYLT. All the opportunities will be there–just offer them up and a motivated scout (which it sounds like your son is) will find the path. It is not much more complicated than that.
Oh, it’s no coincidence that children of volunteers tend to get more out of the program–not because these parents tend to push their kids, but when scouting becomes a family activity, attendance goes up. Offer your help to ensure the troop is youth led as much as humanly possible.