Kos is the third largest in the Dodecanese chain of islands. The town of the same name is the largest in the island and is known for its pretty whitewashed buildings and for its proximity to numerous Ancient Greek, Byzantine and Roman ruins. Kos is said to be the birthplace of Hippocrates, he of the famous Hippocratic Oath, and the plane tree, known as the Tree of Hippocrates, where the ancient scholar once held court is an essential stop.
Be sure to visit medieval Neratzia Castle which overlooks the harbor. The port is a hive of activity and you can stop to admire luxury yachts or enjoy a break at one of the many cafes and tavernas that line the waterfront. Both Kritika Beach and Kos Town Beach are popular with locals as well as holidaymakers and, of course, the town is a great starting point for road trips in the region.