Yeah, they definitely need time to look out a window and imagine.
But I think there is serious value in organized activities. From Junior high through high school I had a rule for mine to do one thing with school, and one thing outside of school. I would have supported more than those 2 things, but I'm so glad I didn't have to.
I'm thinking about enforcing the same rule in college, with a caveat that Gym and Girlfriend don't count, but it seems weird to make those kinds of mandates for someone that has a job.
Enforcing? He'd presumably be an adult, and the entire point of university is to get out from under your parents' wings. This sounds like a horrible idea.