In 2006, the "happy planet index" named Vanuatu, a tiny archipelago nation in the South Pacific, the happiest place on Earth. Determined to find out what all the fuss was about (and having already been to Denmark, 2008's "happiest country," and not finding it all that excessively cheerful a place), I booked a ticket and, two weeks ago, went there. Actually, I went there to go scuba diving and watch volcanos spurt lava from unsafe-by-Western-standards distances, and partly because whenever I told people... READ ON