Every month, the Vancouver USA Marathon & Half Marathon hosts a FREE run called the What? Run. It's a 3-6 mile long run through Vancouver, on a Wednesday evening. The start/finish is at a local restaurant, there's music and you get a free beer. They raffle off t-shirts and race entries, and it's an all around good time. You can walk, you can run, whatever.
If I'm going to go for a run anyway, I might as well get a free beer at the end.