Either by boat or a plane, someone can easily arrive in Kos. The main port and airport of the island, especially during the summer season, have all the necessary infrastructure to accommodate a large number of visitors that can exceed 1 million, or about 150,000 per week.
The movement in Kos is easy too. You can hire a car, motorcycle, or bicycle to move around the island, or use taxis and buses which have frequent routes from the city to a lot of destinations within the island.
In the summer there are regular direct flights not only from Athens, Thessaloniki and other Greek cities but also from many cities in Europe.