Albert if you decided to come to Greece, then you must sellect the time,
for example, Corfu has a unique Eastern, but its better to go when East Church has Eastern, Rhodes is very beatifull but you better go the time that butterflies born,
Cyclades are beatifull in Summer a little crowded by celebrities some a little bit early Christian architecture some other islands,
west islands are beatyFull also, but reminds italy,
Crete is unique, cause has many cultural origins antiques and style,
even autumn and spring you can swim.
Athens is a big city bigger than LA 4 500 000 people, so go only to see monuments,
its a city,
although near Athens is Sterea and the Delphi museum,
Peloponese is beatifull specially in summer, and has Big History, and different styles,
there you 'll find Mycaene, the Hommeric city, you see Sparta, you see last Byzantine culture from last Emperrors, also Tower-houses from Greek indipednce 1800
and offcourse Olympia the origianl area of Olympic games,
Epirus is different as Makedonia and Thrace,
Epirus has very ancient like Dodona and early culture, Ioannina with castle, crusaders time, and Ali pasa island when Greece was under Turk-Albanian occupation,
Makedonia is the place of Alexander the Great, many monuments, and has also winter games areas in mountains, the Makedonian Gold, The ancient city of Thessaloniki, of many cultures, the holy city Dion, and can swim mainly in summer time,
The Christian Holy Mountain Athos with more than 24 monasteries, Chalkidiki etc
Thrace has another colour, reminds the Ottoman occupation, and a sacred island of Samothrace,
depends what you want to see and live,
Glamour-celebrities,
Monuments very ancient antiques, later ancient roman, Byzantine and protoChristian, Crusaders time, Ottomans era,
swim and good relaxing vacations,
Greece has same climate with central and south Italy.
if you want a tour is ok. July is a little Bit crounded, also in 1st half August,
Greece has islands with 50 people total empty and with hundred thousands,
but Avoid vacation at Athens, only for monuments is worthy,
Especially in summer, and remember the riots time, so το avoid suffering,
Although many look same, and have same climate,
every country in mediterrean is different
it depends what culture you are more addicted,
Italy south Italy is almost similar, and also beatifull,
the more you go north Italy changes, Rome is Rome, every body knows,
and the more north the Venice the Genoa the Alpen is another Italy,
although i have been many times,
i can't help you with Italy,
maybe ask an italian,
But where ever you go first ask about local festivals and fairs
every place is different at festival times,