The offshore island of Kekova is one of the most interesting attractions near Kas. The island is famous for the underwater ruins just offshore known as the sunken city.
The best way to get here is by a yacht or boat cruise from Kas or Üçagiz, as the boat can take you right up to the ruins. Alternatively, kayaking trips to the sunken city are extremely popular and allow you to get an even better look below the surface.