‘Less tourists head to Thailand’ (Straits Times website, 0705 hours on 19 September 2008).
Make it fewer tourists, since tourist is a countable noun. Use less only with uncountable nouns, e.g. less salt.
[Update: headline was amended at 0918.]
A blog dedicated to English grammar, usage and phonetics/phonology, and errors by proficient users (because they teach us more than typos and badly written signs by the semi-literate)