I came across an app on my iPhone called "Zombies, Run!" And I love it. It's a story about zombies that you listen to in your headphones when you run. As you run you pick up supplies that you use to build up your community. I've used it twice so far at it is awesome.
Usually it's $8, but I found out its on sale for half off until Halloween! Otherwise I wouldn't have paid so much for it.