I just want to caution first time runners at Disney races. If you have a race time in mind, be prepared to throw it out the window if you also plan on stopping for character photos. Also, you can still run at your race pace, but you should practice the stopping /standing / starting that takes place at the character photo stops. If you are not used to it, it can lead to injury if you are a fast runner.
I found that I needed to ease up a bit on my pace in order to accommodate all of the stopping/starting as my hamstrings were starting to tighten up.