Access to Castleton Caravan Club site

Ebonyandtia

Hello I am hoping that someone can advise me; we are travelling to Castleton from Doncaster tomorrow...not a long journey....but are unsure of the best route.  Route finder is sending me through Sheffield which I don't fancy, the alternative is through Dearne
Valley.  Does anyone know the best way and what the roads are like for the last part of the journey.