The National Park Service and the National Park Foundation, the official charity of America’s national parks, invite people everywhere to enjoy, explore, learn, share, and give back to America’s nearly 400 national parks during National Park Week 2012. Celebrating the theme, “Picture Yourself in a National Park,” National Park Week will run from Saturday, April 21 through Sunday, April 29. Throughout the country, visitors can enjoy the beauty and wonder of 84 million acres of the world’s most spectacular scenery, historic places and cultural treasures for FREE!