I'm with the others. There is not much worth in the coupons. I like the one Dave pointed out about getting a souvenir glass for the price of a regular drink. The wife tried many times to use that one and there wasn't anyone on board the ship that knew what the souvenir glass was! The closest thing we could find was the cheap plastic drink glasses that we didn't want anyway. On our early cruises with carnival, the souvenir glasses were actually glass...We still have them.
Most of the coupons require you to buy something you don't want or have restrictions that don't make them worthwhile.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013