Track Shack. Held in conjunction with the 5K and 10K road races they put on throughout Central Florida, the kids races vary in length from 100 meters to 1 mile. While registration on race morning is required, participation is free and all kids receive a ribbon for completing the race.
Here is the schedule of upcoming kids events:
February 19th at 8AM - Run Around the Pines (Orlando, FL)
March 26 at 9:15AM - Winter Park Road Race (Winter Park, FL)
In addition, the Track Shack will host the Smile Mile, a kids-only running event, on March 12th in Winter Park.
Information on any of these races can be found on the event page of the Track Shack website.