April 19-27 is National Park Week in the U.S. All parks are free to enter Saturday and Sunday , April 19-20 . `` These range from big natural parks to smaller historical sites . '' Campground and concession fees still apply . What 's the best national park in the world ? Comment:
April 19-27 is National Park Week in the U.S. All parks are free to enter Saturday and Sunday , April 19-20 . Campground and concession fees still apply . What 's the best national park in the world ? Comment: