Personally, I've always felt nigh claustrophobic when surrounded by trees. Give me the flat, wide-open desert, though, and I feel sublime. There's something pacifying about seeing as far as my eyes can see. Now, I do love some national parks, such as the Grand Canyon, or Zion, in which you can become surrounded by trees and mountains and feel utterly awestruck at the beauty. But I feel my spirits tick up as soon as I hit the vast expanse of desert again upon exiting the trees.