I have found that the best way to find a new interest is to at least try it once. I enjoy all types of sports (tennis, golf, soccer, Ultimate Frisbee, etc). I also love to ski, anything that gives me an excuse to go out in the snow.
I film movies from time to time as a creative outlet. I usually try to do a film project once a year. I usually focus on satire and dry humor, looking to shows like Arrested Development for inspiration.
I learned a long time ago that if you shed these preconceived comfort zones, you can have a lot of fun, and meet some interesting people along the way.