So you're not a runner — that doesn't mean you can't fulfill your dream of finishing a marathon. Many races allow and greatly encourage walkers. Here's a huge list of upcoming marathons to choose from, brought to you by Runner's World. A1A Marathon: Feb. 21, 2010 Austin Marathon: Feb. 14, 2010 Baltimore Marathon: Oct. 10, 2009 Big-D Texas Marathon: April 5, 2009 Buffalo Marathon: May 24, Read more