Sampson SP is a lot cheaper than a KOA. Boondock sites or electric only sites available. Water fillups available at the park. Very pretty park with lakeside sites available. Used to be a training facility for the armed forces. Museum dedicated to the camp on site. Recommend Loop 5. Huge sites on the waters edge. Reserve America best for booking.
Just North of the park is a retired military facility. Home of many rare all white deer. Easy to see. You will be in the middle of wine country. Hundreds of small wineries, several other SPs, Amish farms and many small communities. Easy pull from the Rt 20. You do start hitting more hills toward Watkins Glen area and south. Personally, I would choose the SP over a commercial campground, unless you are the type who needs a heated pool, cable, WiFi etc.
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