It's probably a Purely mental thing, but whenever I get up into the mountains everything seems so much sharper and clearer- sight (especially contrast between shadows) smells, hearing, and even touch. That's why I like to go camping so much...
And if it's raining or snowing... the happiest I've ever been is huddled under a tarp while sleet came down, running out to grab some stick to hold the tarp up with, going to sleep with my dog at my feet curled up in my coat, and waking up and seeing fresh snow...
But as for spacing out, yeah, if I start walking around in the forest my mind clears up and I just keep walking and walking...