I've recently posted some information about Scouting in Switzerland and don't want to push this too much, but I happen to know the scouting club of Bonstetten and some of their former and present leaders. It was always enjoyable to cooperate with them and I'm sure they have kept this spirit. It is not a big club and its name is Albis & Felsenegg. If you want to give it a shot you can contact them through their website and they'll invite your son to take a look at a Saturday afternoon or two.