My family has visited Pymatuning park many times now and try have used a variety of spots at Jamestown campground. It is large, offering multiple options for campsite types. It’s a standard PA state park campground offering bathrooms (bathrooms are older, but are being renovated July-August 2021) showers, fire ring, picnic table, etc. Campsites J-106 thru J-116 are well shaded, but are alongside route 322 which maintains consistent traffic at all hours. If the noise is not an issue, this run of tent sites are well spaced, and offer easy access to the facilities. To be away from the road (and nearer to the lake) sites J-120 thru J-128 are closer together but can be quieter (depending on your neighbors…)
The beach area is clean, and raked often. It has a playground and volleyball court. On Friday’s they have a family movie night at the amphitheater. Most Saturdays in the summer they offer crafts and activities for kids at the beach.
The surrounding area also has plenty of activities to offer: Local restaurants, ice cream, hiking, kayaking/boating, fishing, etc.