I'm not sure what the deal is with the 500 acres of land but it might be a good idea to put in a KOA type RV-park/campground. Since you are free in the summer you would be able to manage it durning the busy season. I know when I was a kid we hauled the camper trailer around with us all summer when we went on vacation to amusement parks and such and sometimes it was tough to find a place to stay. Not sure if you could do it for the money you have but you might be able to start small with just a few spots and expand as business grows.