What summer lessons?

I'm quite at a loss on what to enroll my kid in this summer. His grades are fine. I do not really like him to undergo more academics during the summer vacation, as I believe this should be his break from them. As with most kids his age, his interests vary widely and shifts around quite a lot too. I remember when he showed an interest in banging things, my mom bought him one of those toy electronic drum sets which held his interest for only a short while. I'm thinking more of sports. Something with a team like basketball or football as he is still quite shy and doesn't really interact well with other people. A team sport would "force" him to cooperate with his peers hopefully. Hopefully, he cannot make a choice between basketball or football. Should I just choose and simply force him to go through it? Hmmmm