We are planning a similiar trip for May of 2016. We will fly into Athens and home from Instanbul around 15 days later. I have plenty of Hilton points to use so hotels in these 2 cities will not be a problem. I would love some advice on the middle 10 days, we would prefer to take ferries over flying and would of course like to stay at Hilton properties as much as possible to save money. We don't mind changing hotels every 2/3 days so 3 stops between Athens and Instanbul would be about right. This might be a question better suited to the Hilton forum but I would think posters here are pretty knowledgable about Hilton choices?
Thanks