I'm trying to improve my skills by copying the style and design of real-world maps. The map below is based on the style of some of my favorites, modern U.S. National Park maps. Practicing is useless without feedback, so I am looking for some thorough critiques. If you were visiting this area, and someone handed a brochure, would you be happy if this map were part of it?

For this map, I was specifically looking at general layout, design elements, and labeling. Any feedback is appreciated.

Click image for larger version. 

Name:	map-letter-200-dpi.png 
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(Map built using QGIS and Inkscape)