Hounds Haven Field consists of 33 acres of land that is primarily used for fund raising functions, such as barbecue dinners and a Summer Craft Fair. This land was purchased by the Hannawa Falls Volunteer Fire Department, aka the "Hannawa Hounds", in 1966. The building is called "The Doghouse", and was erected in 1968, with the kitchen area being added on a few years later.
You are looking for a hide-a-key container - it's hidden a short way into the woods, so a bit of bushwhacking might be needed. Be sure to bring your own pen for this one - happy caching!