The most common way to travel between Greek islands is by ferry. Greece has an extensive ferry network, connecting the islands with the mainland and each other. There are different types of ferries available, from high-speed catamarans to slower conventional ferries, and the journey time can vary depending on the distance between the islands. You can book ferry tickets online or at a local travel agency in Greece. It's recommended to book in advance, especially during the high season, as ferries can sell out quickly. Another option for traveling between the islands is by domestic flights. Greece has several domestic airlines that operate flights between the major islands, and it can be a convenient and time-saving option for those with limited time. An even more fun way to travel between or simply get an aerial view, is to book a helicopter tour. Lastly, private yachts and boats are also available for hire, providing a luxurious and flexible option for island-hopping. It's important to note that this option can be quite expensive, and it's recommended to book well in advance.