Launch the program
Each morning, ask the children if they walked to school and mark it on their reward chart. This could be done by a teacher or a student. This shouldn't take more than one or two minutes each day.
Each Friday, the children can complete a Thank You Adventure sheet with drawings or stories of things they've experienced while walking to school. These can be taken home to show parents and to ensure their continued support.
Once the children have earned and enjoyed their reward it's time to select a new reward and start the process again.