Archery sounds like a great idea! Just so as long as you don't take it up thinking it will catch his interests, but I know I don't have to tell you that. One of the things that make it great is that it requires total concentration - which takes your mind off of things. My brother has both compound and long bows. I never learned to shoot them, though.
I, too, love the outdoor stuff. Great hobbies you have. Love hiking, too. When was stationed in upstate NY, spent many a time hiking on the trails and all. Good stuff.
The point of me asking about hobbies is that they are a great, great way to occupy your mind. For a long time after BD, I didn't do mine - until I restarted and really dove in. Helped me through some of the darkest of times.
And the punching bag works great! Especially if you tape a picture on it...
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.