The Cyclades are justly famous for their hiking. Ancient goat and donkey trails go everywhere—through fields, over mountains, along untrodden coasts. Since tourists crowd beaches, clubs, and town promenades, walking is uncrowded even in July and August. Prime walking 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 when dozens of gatherers spread their cloths.