For as much as I hate to say this, I'd say Conneaut Lake Park. 
Before last summer, I would not have said that, though.  
  
Last summer CLP was just, sad. half the rides were broke, and when you only have 12 rides to begin with, that seriously ins't good. The Park looked dirty, unkept. Sure, I know the park is broke. I keep hoping for something good to happen, but doubt it at the same time.  
At least I've got good memories of when the park was doing good.