Lots of offseason cruises have discounts after the PIF date. GT, Military and Florida res rates have been plentiful. Trust me it is the only way I would have cruised 9 times in the last four years. Our cruise in Feb dropped 1700 over opening day prices. The cruise the last week of April also dropped considerably. All that being said every year is different. I would never pay 6700 for a Caribbean cruise when I know I can go for half that by being flexible, but we are a family of four. Since you are a family of five you may not have a choice. They never discount staterooms for five. You would need to book two rooms to get a discount.