Have you looked at the National Kidney Foundation 5K? It is technically not a Disney race but it is run though Epcot in March. I happened to be in Florida last year on that weekend and ran it. You start in the Epcot parking lot and run to the left of Epcot (the side with Wonders of Life), around an employee parking lot, around the back of Test Track, Wonders of Life, and Ellen's Energ. You enter the park and run into and then around World Showcase from Mexico around to Canada and then exit the front of the park for the finish. It was a lot of fun. On a side note I am going to be looking for a 5K in the Disney area the morning of the podcast cruise since we are getting in the night before. I'm hoping there will be a Disney event but if not I'm sure I can find something in Orlando or Clermont since it seems they have a lot of 5Ks there.