It's funny that people don't think of this, or don't want to do this. I was sent to Europe for a two week engineering conference and took an extra weekend to explore a little on my own. Out of the 7 americans on the trip, only one other did the same thing.
We had another engineering conference in Colorado and I was amazed that only two other people wanted to go out early and hit the slopes. The company payed the airfare so all I had to do was pay the extra nights stay and lift tickets...total no brainer to me. I'm sure everyone has their reasons one way or the other, but opportunities like these don't pop up everyday so it's hard for me to understand why everyone doesn't make the most out of them.
Whoever dies with the most toys wins.