Sandy beaches and rich history are the two major attractions of Kos, along with vivid nightlife.
Kos first of all known as home of Hippocrates, father of medicine, gives the impression of an open-air museum, where you will see ancient and mediaeval monuments as well as numerous archaeological sites, and spot the buildings dating back to the Italian Rule.
As you get around in the town of Kos you should visit the mediaeval Neratzias Castle, the popular Platanou Square, where you can see the Loggias Mosque built with material from ancient structures in 1786. Across the mosque don’t miss Hippocrates’ 2500 years old plane tree; it is believed that this is where he taught his pupils and examined his patients.
Last but not least, head to the Asclepion of Kos, popular during antiquity, located 3.5km NW of Kos town and built in the 4th c. B.C. following Hippocrates’ death. Also see the stoa, the Roman baths, the Altar dedicated to Helios (sun), Imera (day), Hecate and Machaona (son of Asclepius), ionic temple of Asclepius and the doric temple of Asclepius (170-160 B.C.).
But apart from the sites there are many popular beaches to swim such as Mastichari, Kardamena, Kefalos and more.