Enjoy a tour of the only state park in the U.S. with a working dairy farm. With more than 100,000 visitors each year, the Duffys and their milking herd are used to having an audience. “Bringing awareness of dairy farming to the broader community is a big part of what we do,” Mark says. They operate a seasonal ice cream and farm stand, raise cranberries and sell composted cow manure. “The good thing is that many people want to buy local products, and they support our work as much as they can,” Mark says appreciatively.