Who are his friends? What are they interested in? My son decided on the H.S. Robotics Club mostly because it's the club that the kids he was hanging out with at lunch decided to join. He struggles with social situations. At this point it's mostly an excuse for him to hang out with other like minded kids, while doing something he enjoys and I see it as more a social outlet than others. In my son's case he doesn't want to do anything else that smacks too much of academics.
Who the other kids are is probably as important as what activity it is especially if he can only choose one.
