Some great ideas.
The corn maze thing I looked into. And although you can have pick your own, farm wagon rides, etc., on the farm with not too much problems, the moment you are not "selling" agriculture, you now cross into "entertainment". I spoke to two farm operations and they said the same thing. Just the zoning alone could be a problem, then there is state licensing, entertainment taxes, liability and insurance issues, and so on. Seems agriculture based eco-tourist is one thing, but at least in Pennsylvania, these corn maze operations are categorized as entertainment and must go through many hoops to operate.