The Buffalo River is the only designated National River by the National Park Service, but it is not a National Park. If you are an expert canoer go to the Boundary Waters in Minnesota. But if you have young children or are a beginner skill level canoer, the Buffalo River is a great place. I highly suggest calling an outfitter and renting canoes. It just make life that much better.
This is a great place to camp and canoe.