Just for the record Little Buddy and I walked and Badger Boy rode his bike. It isn't a bad walk, all of about 15 blocks. I've walked it many times in the 6 years we have lived here and the kids have been in that school. The kids walk or ride their bikes to and from school once they are old enough.
The problem I see is that the children (and parents) I saw walking are the same parents I see every other day doing the same thing. Did I see any of the heavier kids walking? No, I did not. What are we teaching the kids if walking to school 1 day out of the school year earns you a prize? I guess it wasn't worth it to most of them whose parents were dropping them off. The school did set up a walking route for those who rode the bus to earn the prize. It consisted of walking around the school, 4 blocks!