On US33, the road leading into the fairgrounds, there is a McDonalds, Burger King, Arbys, Taco Bell, Lux Café, Wings Etc, Taco Time, a Chinese Buffett, Ponderosa and maybe some others I am missing. All of those are in a two mile radius of the fair grounds.
As others have mentioned, South Side Soda Shop is good, cheap and a little funky, same with Olympia Candy Kitchen.
If you are looking for some other options, The Constant Spring in downtown Goshen is a newer Gastropub with a cool atmosphere, great craft beer and some good eats. If you love ice cream, be sure to hit the Chief, its fantastic!