For yacht chartering anywhere in Greece, call GPSC Charters at 800 732-6786. Rates for the 1995 season range from $180 a day for a 31-foot boat with two cabins to $925 a day for a 61-footer with five cabins. The services of a skipper are $125 a day; hire one and get a 5% discount off the boat rental. The typical charter period is a week to 10 days. I recommend the longer term and a loose itinerary, to allow for the vagaries of weather. You can get additional travel information by calling the Greek National Tourist Organization at 212 421-5777.