Head to Fort Smith, AR on the 31st for the Ninja race, which offers 5K, 10K, and half marathon options all starting at 8:30 AM. You'll need to register ahead of time on RunSignup (no day-of registration available), grab your packet between 30 minutes before and 10 minutes before the start, and park in the lot across from the playground. The 5K and 10K use an out-and-back loop repeated 2 and 4 times respectively, while the half marathon repeats the same type of course 6 times, with a 3 hour 30 minute time limit for all distances.