To any who would consider a trip, read the article carefully and do independent research. Distinguish between setting up a measure/goal of happiness and actually achieving it. The tourist/visitor experience is almost completely managed (like North Korea, though I'm not really making a comparison between the countries here). Still the author of the article was aware of filth, poverty and other non-"happiness" conditions. Think of what was shielded from view. Literacy among females is 55% and per-capital GDP ranks 150th in the world (...though, admittedly, money won't buy happiness) it's a strictly patriarchal place, from what I could tell, from the King to citizenship, which can only be acquired through a father.
http://www.oocities.org/bhutanwomen/statuswomen.html
Still, Bhutan does have some beautiful scenery, though many waterways have been converted to hydropower production, with all the ill effects that come with that.