In what can only be described as a ‘long thread’, this massive nugget of information over at the official EU forums details all the tracks, alongside screens and info on each one.
Apparently, the Island is divided into four different zones: Earth, Wind, Water and Fire, each with 4 tracks (making 16 in total). Each zone has it’s own climate, hazards and vegetation. Bizarrely, they mention Fire, Water, Earth and Air, but we presume they mean Wind.
Anyway, read through the entire thread and enjoy yourselves. The best thing? You’ll only need to read 3 user comments before the end of the page if you accidently scroll down too far. Also, one map looks vaguely like a penis.