The Cyclades are rightly famous for their hiking. Ancient goat and donkey trails go everywhere - through fields, over mountains and along open coasts. Since tourists crowd beaches, clubs and town promenades, walking is pleasant even in July and August. Prime hiking months, though, are April and May, when temperatures are reasonable, wildflowers seem to cover every surface and birds migrate. October is also excellent for hiking - plus, olive groves provide their own sort of spectacle with dozens of gatherers spreading their cloths.