Patmos
It is probably impossible to make a full and complete presentation of all the Greek islands, there are so many, they are all so varied and each is unique, so that an exhaustive description of each and every one is impossible. This means, of course, that apart from the more famous of these, there is still infinite scope for exploration either by yacht, or island hopping by ferry and caique as well, for the more adventurous. However, one island that certainly merits a mention is Patmos of the Dodecanese islands (north of Rhodes) where St John was inspired and wrote his "Reveleation". Apart from the beaches and the warm summer nights one can enjoy here, a visit to the monastery of St John Theologos can be really rewarding. It helps to give a wide perspective of the limitless depth and scope of the history and culture these islands generated.
The Islands of the Saronic Gulf
Perhaps the most popular Greek islands are the Argosaronicos ones situated in the Saronic Gulf, i.e. Aegina, Poros, Hydra and Spetses. These lie less than an hour to two hours away from Piraeus by hydrofoil and provide that unique blend of rock, exquisite sea and blue skies. Aegina is home of the Temple of Aphaia, made of Parian marble and discovered (and also plundered) around the time Elgin was plundering the Parthenon.
It remains well preserved and well worth visiting. Poros, once the Naval Capital of Greece, was home to its first naval base in whose buildings Greek Navy conscripts are still trained. One can also find the ruins of a 19th century Russian naval base and enjoy exquisite swimming. Hydra, another gem of an island, is also unique in that it is probably the only island where there are NO cars and Spetses has everything from a short stay to a long holiday, from beaches to tavernas with succulent mezedes and night life for the young and young at heart.