It doesn't have to be large depending on your plans for the park. You could do pick your own food with edible landscaping. You could create a beautiful arranged garden similar to azalea gardens. Offering lessons in foraging/survival or floral garden arrangement might be a good side business. A third option could be to have a cordoned off area where you can let dogs run around but only do this if you know how to manage a large group of dogs in close proximity.
Could always do hunting depending on the animal population of your place but you might run on the wrong side of the law with that one so do research obviously.
Were you playing on making it a "for profit" or a free access park?
Edible Landscaping by Rosalind Creasy should be at your local library, or you can purchase it used online.
In any garden your edibles are open to premature harvesting by deer, squirrels, birds and, if they are in the front yard, by other people.
The first thing to think about is fences and hedges, then design your edible landscape.
It doesn't have to be large depending on your plans for the park. You could do pick your own food with edible landscaping. You could create a beautiful arranged garden similar to azalea gardens. Offering lessons in foraging/survival or floral garden arrangement might be a good side business. A third option could be to have a cordoned off area where you can let dogs run around but only do this if you know how to manage a large group of dogs in close proximity.
Could always do hunting depending on the animal population of your place but you might run on the wrong side of the law with that one so do research obviously.
Were you playing on making it a "for profit" or a free access park?
Check out Edible Landscaping, Landscaping with Fruit, and The Edible Front Yard for inspiration.