Fact: By managing your time you can protect the fun stuff and ensure the other ares of your life don’t encroach on it. Take control of your time and do MORE fun stuff.
You do this by (a) scheduling it so you have a better chance at getting to that activity; and (b) keeping the less-fun-stuff contained. A healthy schedule includes margin and breathing room, as well as time for you to relax, goof off, have fun, and go on adventures!