When ever I'm on a vacation, I try to stay away from computers as much as possible. For example I had a five week vacation this year and I used the Net only three times. And on each time it was about checking my email. (Yes, I checked my email only three times in five weeks! There were quite many unread messages waiting for me each time :-) )
At work I have to stare the screen 8 hours per day. I don't want to do that when I'm on vacation. It is not good for your physical well being to sit all day long.