Samui Island Marathon 2011. The event on 18 September, 2011 is now accepting applications.
There are four runs to choose from: a full marathon (42.19km), a half marathon (21km), a quarter marathon (10.55km) and a mini marathon (for kids; 5km).

You can even do a 2-km fun run if you don’t wish to compete for prizes, which incidentally are worth B3 million in total. The winner will also receive the HRH Princess Mahachakri Sirindhorn Cup (though there’s no greater prize than finishing in one piece, we’re told).