When I was younger my parents would pack my sister and I into the family car and we'd drive around the country for 6-8 weeks during my summer vacation. Most families would be down the shore, and I'd be off in Nova Scotia, Moab, San Francisco, the San Juan Islands, or Whistler. By the time I entered high school I'd visited 48 states - so I've been used to traveling for quite some time. I also spent a couple summers doing house exchanges in London, Edinburgh, & Paris - so learning about foreign cultures came at a very early age. It's been hard to stop I guess!
I work in consulting now and will in 2008, probably fly close to 300k miles.