And if you are so fortunate as to have so much money and jewelry that you can't fit it all in your room safe, the pursurers desk could probably arrange to hold "extra" items in their safe.
But realistically, you should be able to get everything you could be worried about into the safe. If you do the traveller's check thing, get large ones to reduced the size of your bankroll
as you can always cash them in at the casino cashier.
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