Speaking of the National Park Service, clicking around their site, I found out that they have released a series of pictographs, symbols, arrows, and other map graphics, and all are free to use, because they’re the product of the federal government, and in the United States that means it’s in the public domain! You can get the imagery in PDF or Illustrator. This rocks pretty hard.
You can also download the map from any National Park brochure.
