Okay, not such a hard task, but it was definitely a new twist on my training. There were some hills, but it wasn't too strenuous. I found a nice route home. The wrinkle was to get home before the oncoming rain; which I did manage.
I don't know if it was because of fear of rain, good training up to this point or that the route just wasn't that hilly, but I managed an average of 15 mph over the 25 mile run.