Food will largely be dependent on if you try and go cheap and pack snacks and sandwiches into the park, or if you plan on purchasing both lunch and dinner into the park. I would probably plan on around $1K for food if you plan on eating both lunch and dinner in the parks along with snacks. Could be less if you pack in lunches and/or snacks. Those saying $4-5K are probably in the right ballpark of what to expect.