Totally have to agree with Texas84 on this. Disney races on fun races with the opportunities to see characters, run through parks. If you are a super fast elite runner then go for breaking a record but for me running three previous Disney races, including the coast to coast challenge in 2013, it's all about the fun and escapism that is Disney.
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Someone even custom upgraded their Corvette into Lightning McQueen - taken during Mile 8 of 2013 Disneyland Half in Toyota Center parking lot (home of Anaheim Ducks NHL team)
Who gets the opportunity to high five Mickey or Minnie or Donald, or Pluto or Goofy at the finish line? Who gets to ride rides, attend special after parties or get a few gift card for the food festival to nosh on after the race? That's the icing on the cake, not the time. If i finish in the window I'm good, and I finished with two decent Disney times.
There are other half marathons that I can focus on my PR times and did so in December 2013 and January 2014. I blew out both my Disney half times by 16-20 minutes. Thank you flat courses and cool temps in Florida and Louisiana.