2 words - hurricane season. You'll find most cruisers aren't symphathic when you complain about your missed port, your extra days at sea, etc., when you booked during hurricane season. Perhaps you *didn't* book thru a reputable TA who would have explained that you are taking a chance.
The ships are BIG, BTW, you can't just "pop in" at a port. Schedules are arranged far in advance. If you've never sailed, you might be surprised to find you like the sea days. They are lots of seasoned cruisers favorites (including mine).
Carnival Elation March 11
Carnival Imagination Sept 07
Carniival Sensation Dec 06
RCI Sovereign of the Seas Sept 06
Carnival Miracle Sept 05
Carnival Glory Sept 04
Carnival Fantasy Jan 04