The french according to a recent survey. Second is India followed by China, Russia and Britain. Ooh la la.
On the opposite end of the spectrum, the same survey has determined that the very best tourists are the Japanese. Americans, despite the bad rap they usually receive, were deemed the second best–although this was a hollow victory as the Americans were also voted the worst dressed tourists according to the same survey (speaking for myself, guilty as charged!).
The five worst tourists according to the survey come from the following countries: