If you missed out on ATL's Runway 10-28 5k race last May; there's another airfield race on July 15 at TEB.
The course involves running along taxiways and up & back Runway 1-19 (so you know that the course is flat). There is even a pace plane (a single-engined Cessna) during the race.
The info. & details can be found in the below-link for anyone who's interested:
Teterboro Airport 5k Race
For those that may ask; yes, I did run this race last year and will be running it again this year.