Let's say we've beaten porn; What comes next?

To give you guys a rough assumption I'm a college student who should be studying 24/7, and I'm gonna be brutally honest, my life revolves around P. Even when P is not around, the P-subs come into play.
I know you're gonna say hang out with friends or go outside but those are the things I've already tried.
Now the question is, what other activities are there, that are as engaging as porn is but you know.. Harmless and actually productive.
Exercise is the only one that comes to my mind, it requires your full attention and it's fun.
The reason I proposed this is that it's important to live a happy life otherwise it wouldn't help even if you're porn-free, and I think it's a lot of people's concern so I opened this thread up.