The Cheese Shop - Plain City, OH
If happen to be in the Columbus area, take a road trip out to The Cheese Shop in Plain City (northwest of Columbus). The shop is run by a Mennonite family, I think, and is just south of town on Hwy 42.
The ice cream is very good, and the cones are HUGE - a couple bucks for a double scoop waffle cone. My fav is the Strawberry Cheesecake.
This place was a regular stop when I drove between Delaware and Dayton. They also make pretty darn good deli sandwiches.