First off, I love how vanilla my runs have become. I just don't think too much about going anymore.
I've shortened up my run intervals. I'm less likely to skip them that way. I felt like I covered more ground more quickly.
I also tried running with wearing a headband instead of a ponytail. It's a silly thing, but I knew I needed to get used to the sensation for the costume. It was not unpleasant. Granted, I'm not that aerodynamic to begin with, but there was a wing quality to it. And I didn't overheat.
I also think that I should keep tapering to a minimum--getting back into it after a break day was icky. I have to make sure I at least walk the day before my 5K if I'm going to keep the time decent.