Outside of band, I am a composer/arranger, as well as a internet session musician. This manifests also as contributions to numerous small, indie video game projects that I compose and produce music for. But, in addition to that, I also consult on said game storylines, overarching gameplay concepts and general non musical stuff. It helps if every member of the dev team can contribute in multiple ways. So this involved quite a bit of writing, mainly to help the game concept not be a meh copy of a much better game.
I started writing a novel in my senior year of high school, and worked on it during college, but have since set the project aside. Maybe I'll go back and finish it at some point. It was a good 100 pages when I left it, but cleaning up the story inconsistencies and finishing it would take far more time than I can afford to invest, so it stays where it is.
During college and my last job, I needed some time away from music, so I started studying languages for fun. Studying in a dry environment, then being able to use that content shortly after was not only rewarding, but it also changed the way I read and interpret English. (Swedish was the first one I studied, followed by Japanese, and now Spanish out of necessity.)
At this point, my time is taken up completely, a lot more than I would like with band directing and grad school (composition), as well as freelance composition and recording, but I would love to go back to languages or writing at some point. Probably after grad school.