It just gives you a more well-rounded appearance; that you have an active/full life outside of working. I'd put down making artwork, hiking, volunteering, listening to music, collecting toys/books, stuff like that. If the job application process includes a psychological evaluation, hopefully, your hobbies give the impression that you're a sane and well adjusted fellow.
Unless I'm applying for moderator at NG.com, then I put down dollfucking, improvised fleshlight construction, cawk drawing, and crazy funstering.