A visit to any one of the United States’ national parks will offer a feast for the senses, from the scent of wildflowers along the Great Smoky Mountains to the sound of a bird call bouncing off the walls of the Grand Canyon. But beyond postcard-perfect views and fresh air, the bounty of the land also lends itself to delicious food at restaurants inside the parks. Blackberries, which so plentifully grow in the Blue Ridge Mountains, star in Shenandoah National Park’s signature ice-cream pie, while on the other side of…