During Neal Stephenson's Q&A yesterday a fan asked what he did when he wasn't writing. He answered (paraphrasing here, of course) that he tries to spend his afternoons doing activities that are directly opposite that of writing. Exercise, computer programming, working on his house, helping a friend build his boat. He said it got his mind off things, at least directly, so when he woke up the next day his head would be filled with ideas and ready to write for a few hours.
Samuel Delaney said something similar to me in a writing workshop in Cleveland a few years ago, that he felt the best job in the world for a writer (particularly a beginning writer) is a ditchdigger. Mindless work, so you can think on your writing while you earn your money and then write when you go home.
In my non-writing times, I'm usually working, playing music, watching t.v., or going for the occassional hike. There may be something to it, though. I often come off of hiking (or even a long drive) with renewed vigor for writing.
But then sometimes I feel disconnected, I feel like I need to finish reading that newest issue of Fence so I know what's going on in the literary world, and that I have to go to that poetry reading next week so I know what's going on locally. All of which takes time away from writing. I guess everyone needs to find that balance that works best for them; I suppose I'm still searching for mine.