Of course I know the December holidays & Easter are the big peak seasons (for filled ships), but when I've sailed at "off peak" times (May & October), the ships go out full too. I've read posts where people have said their sailing was only 2/3 full. When are these times? What months/weeks (if ever, since there is not much capacity to begin with) are my best chances for a less than at capacity ship? 3, 4 or 7 days less booked?