Another suggestion--if you still enjoy running vs. run/walking. I follow a plan called "Run Less/Run Faster"--don'let the name scare you off. But basically, it's 3x/week--one interval workout/one tempo run/one long run. What I like about it: 3x/week is less wear/tear on the body and since I didn't start running til age 49, I liked that. I also like the variety of the workouts. And it's based on whatever your current fitness level is, i.e. the training paces are based on current 5k time.
Granted, this type of workout is still geared towards improving race result, but it's not ultra high mileage.
Otherwise, I think Galloway is a good way to go. I have no experience with it, but a lot of WISHers do--even have at least one Galloway leader on the boards.
Good luck,
Maura
I might have to check that one out. Thanks.