Attended a workshop on this... the theory sounds easy. The reality is an absurd amount of work... and you need GPS!
No actually, if you're into people this can be fun, sort of. People do all sorts of things (like drop trash) you might not want, but they do pay money. However, here in VT the harvest season and the tourism season don't run parallel, so the corn grown for the mazes is chopped and left in the field as compost.