Music. I have my guitars right next to my computer and hooked up through my external sound card. So even when I'm watching Netflix I'll pick up my guitar and play underneath it. There isn't a day that goes by when I don't pick up a guitar or go and practice drumming.
I used to have a lot more. Photoshop/graphic design, reading, writing, maybe some others I'm forgetting. But I feel like any time spent doing that is time that I'm not working on music. Which in a way makes me question whether music is even a hobby for me anymore, it's probably more of a lifestyle choice or second job.