While at Flagstaff lake the other day, I met a couple of people who had spent the summer thru-hiking the Appalachian Trail. I enjoy day hiking and can see myself getting into doing some over-night hikes, but taking on the challenge of a long trail like the Appalachian is truly mind-blowing. We're talking walking around 2000 miles over some of the hilliest terrain on the planet. Beautiful, but tough.
So my admiration goes out to these people as they reach their goal of being a 'thru-hiker', someone who walks the total length of the trail in a single season, more or less non-stop. Many people keep an on-line journal of their experiences which can be accessed here.