Camped here after spending some amazing time in Badlands NP. French Creek looks like a cozy place normally but we got unlucky with the weather. Fortunately the weather while we were at the national park was wonderful. I would definitely stay here again. The campground is small with toilets, picnic tables and fire rings. Pack in pack out. Very clean.
There seems to be plenty of hiking and biking, swimming, fishing kayaking of one wanted to as well. There was only one other group here in and they mentioned there's copious amounts of horse trails as well. If the weather was better would have explored more. We just packed on up and kept a cruising.