It sounds kind of lame, but make use of whatever facilities are provided with your tuition. That's something I've been paying for since day one, but only just realized I should start using.
For my university that means a gym, gymnastics room, indoor and outdoor track, ice rink, swimming pool, climbing wall, bouldering gym and yoga classes. Plus we get free tickets to sports, theatre, dance and music events at the school; and discounts on classes and rentals through the university outdoor centre.
My friend's university will even partially reimburse him for any concerts he attends.