We camped at Suquehannock for the first time in August 2020 and had a fantastic time with our dog!
Don't be alarmed by the fact that some reviews call this "primitive" camping-- there are restrooms with well-ventilated composting toilets, potable water is available at the entrance station, and our campsite was very flat, clean, and safe.
Old Logger's Trail can be reached walking from the campground, and there are many other hiking/biking trails within a 15-minute drive. Boating is also possible at some of the campsites.
My family lives near Greenbelt National Park and we have hiked the five-mile perimeter trail dozens of times with our dogs. However, this park has a serious bug problem. Most of the time, we return home from our hikes only to find ticks on at least one of us!
We were excited to finally tent camp at Greenbelt two years ago for my wife's 30th and had a memorable time around the campfire, but were disappointed the next day that chiggers and ticks had once again swarmed us on our hike. Enjoy the camping but wear bug repellent and stay out of the tall grasses!