The bad.. (my rant)
Walking is not 7 minutes per mile! 2 years ago when I ran this I started in the 10 minute section and ending up walking almost the first half mile, so this year I lined up at the 7min mile knowing I would run between that and 8 min mile. However there were a large number of idiots walking and running very slowly who did not seem to understand why they should line up correctly.
Also these walkers/runners tend to run in pairs meaning all of a sudden the path is blocked in front of you. Afraid after the 4th or 5th last second dodge around people, I lost my patience and barged between the next pair. (hangs head in shame, I know very rude). I did notice all the dodging did tweak my hamstrings a bit while they were cold and it took a while to warm up properly.