As this is a tourist developed island, things to do in Kos are plenty. A very popular activity is windsurfing. There are windsurfing centers in many beaches around Kos island that rent equipment and offer courses. The most popular windsurfing beaches in Kos are Mastihari and Kefalos.
Diving is also gradually developing on the island and diving trips are organized to close uninhabited islets and old wrecks. On the most organized beaches of Kos, there are also water sports centers with fun games.