Delaware has several areas that could make great national parks, and I've always been surprised that they have never really fought for it. My family and I often go to Delaware, not just for the tax free shopping, but for the bird watching! Cape Henlopen State Park would be my number one recommendation for upgrading to National Park status, it is just gorgeous and full of great wildlife watching. Fort Delaware State Park would be my second recommendation, very cool place indeed steeped with history.