Hello Walt,I am not an expert about chartering boats in Greece as I never did. What is fairly unique and positive about Greece for sailors is that most ports and marinas are free of charge (or were up to 2015), although without any service (toilet, water, electricity). In some marinas fresh water is available along the piers. After 2015, Cost Guard authorities started to claim a fee, still very small, in the range of 3-5 euros, from what I heard. A new tax is planned for this year but still much less of the sums we pay in Italy (marinas) or Croatia (entry tax plus marinas).Likewise Italian marinas, some Greek marinas/ports may be crowded during summertime in the main touristic areas, including around Athens.If you plan to sail in the Aegean sea during summer, you have to factor the famous Meltemi wind which may blow above 40 knots. The coast along the Peloponnese is fairly protected and if you plan to go south, more manageable. My personal experience in the Aegean is limited to Aegina Island (Perdika), Hydra bays, Monemvasia (Jefira port) and Kithira Island (Agia Pelagia). I liked the most Jefira port as fairly protected, almost free from charges, with fresh water available along the pier, outside mass tourism routes and close to the Monemvasia gem.Sailing from Italy, I usually enter Greece in Corfu where I stay at the Corfu city mandraki: the small marina close to the old Venetian castle, near the old city, a fairly unique location and a pleasant little marina.Then I sail south through Paxos (Lakka bay), Kefalonia (Fiskardo), Zakinthos (Agios Nikolaos - Vromy Bay). Zakinthos is the southern limit for mass tourism. From here on, is the paradise for the sailors who prefer quiet bays/ports. South of Zakinthos I usually stop at Pilos (Navarino Bay) and Porto Kajo, a pleasant, protected bay on the tip of the central "finger" of the Peloponnese.Fair winds,marco