Don Gorge? never heard of it and I live local,
I've googled it and we call it Sprotbrough falls nice pub meals at the boat inn but prefer the Crown at Barnborough, Barnborough also has the cat and man church.
I'm not a C&CC member so would choose Thrybergh Park plus its easy to get into, give them a ring I think they now have a resident warden (or had).
Both are handy for Sprotborough falls (Don Gorge), Conisbrough Castle, Wentworth Woodhouse, Brodsworth Hall etc etc
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A plus for Thrybergh Park is that it has a nice café and its a nice walk around the reservoir, I used to fish there a few years ago.
Another minus for the ferryboat is if the winds in the wrong direction you'll get the smells from the sewerage works downstream
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