You forgot..........school teacher, school district employee.
I can't help but wonder if the reason the girls did as they were told and headed down the hill after they were instructed to "Gi down the hill", is because they either recognized him or actually knew him. Believing they were in trouble for walking on the bridge when it is prohibited, they did as they were instructed, thinking all along that they were going to be in big trouble when their parents were called in. If that scenario turned out to be true, then that means we're looking for someone that the girls would've considered an authority figure as well as someone that lives in the community.
If the girls actually knew him...........well...............then the suspect pool just got very small.