Every moment in life is a prayer, or could be. I think you can pray yourself into the mystery of the moment, or allow for the blessings of the moment to sustain you. Every moment is an invitation, and whatever you do in that moment, if it's dedicated to God, then it is a prayer.
Once I enter wilderness, I am more honest with myself. The lure is less what I can tally or photograph than what I can sense: the quiet, intangible qualities of desert, mountain and forest. Wilderness has been characterized as barren and unproductive; little can be grown in its sand and rock. But the crops of the wilderness have always been its spiritual values -- silence and solitude, a sense of awe and gratitude -- able to be harvested by any traveler who visits. Prayers in the wilderness were like streams in the desert for me -- something unanticipated and unchronicled welling up, and because of that surprise, appreciated all the more. Not until I actually left the wilderness was I conscious what had been the extent of my thirst.