So what is the difference between today's hiker and John Muir? Was he more prepared? Was he in better shape? Did he have better survival skills? Did he have more time?
Well, he definately had more time. He didn't have a 3 day weekend or a 7 day vacation to adhere to. He could be gone for months and had nowhere else to be. So did he get lost? Probably. Did he panic, probably not. He just kept going.
He knew how to eat off the land and slept under the stars. He could drink the water because it wasn't full of giardia back then as far as I know, and he could also trap/kill animals for food, something you can't do now.
He was also as fit as the most fit of today's hikers, not like the one week a year hikers who push themselves to their breaking point, literally. He could go and go and was well suited to the task. He had trained his body for the altitude, something few of us do today.
The point is, that if you are prepared and well trained, AND have enough time, you can do anything today, go anywhere alone, within reason. You do have to bring all your food, since you can't eat rabbits, squirrels or anything else, except maybe fish that you find along the way.
Of course, my post is my opinion, and based on a lot of assumptions. Curious what you all think?