Every possible tourist activity falls into one (or in a few cases, several) of those categories.  Satisfaction comes from doing something that is more extreme and interesting and new in one of these six ways.  Tourist activities cost money, of course, and the amount you’re willing to pay is increased by what extent it fulfills one of the six categories (and correspondingly limited by the total amount of funds you’ve got at your disposal).

 I'm digging Travis' perspectives.  Read more here.

Thanks to Geeky Traveler for the link.