Last night's marathon dream was atypical, in that I had apparently started on time and knew the route (there was an out-and-back stretch that I seemed to remember from other marathon dreams, apparently in a skyway of some sort). For some reason, however, I was running all by myself. It was only when I saw another runner on that out-and-back stretch that I knew for certain I was on the right course.
At some point, I ran into David and bummed money off him to buy some Sport Beans, as I'd forgotten to buy any of my own. He had started later and/or was running a shorter race, and said he was "taking a lunch break."