Sunday, 8/4, is Great American Outdoors Day, and to celebrate, all entrance fees to national park sites and national forests are waived! The ParkPassport App can help you find a new place to explore. Discover parks, trails, and scenic spots to plan your unforgettable outdoor adventure this weekend! 📲🌳 #ParkPassportApp #GreatOutdoorsDay #OutdoorsDay #August #OutdoorAdventure #Saturday #NationalParks #FeeFreeDay