The document introduces several lesser-known national parks to explore in 2019, including Olympic National Park in Washington known for hiking trails, Rocky Mountain National Park in Colorado with over 350 miles of hiking trails and wildlife, and Congaree National Park in South Carolina home to the largest area of old growth hardwood forests on the east coast. It also mentions Everglades National Park in Florida consisting of mangroves and marshes that is home to endangered species, and Valley Forge National Park in Pennsylvania which provides historical context to George Washington's winter camp.