I am pretty sure that is the old Mississippi Queen we went on several years ago. You must be in one of the suites, as we were in just a standard balcony and I don't remember it being close to the same size as Regent suites. Now. that said, its possible that they have done a refurbishment and redesigned the cabins and made them larger, thus fewer. Sounds like a fun trip and I'm sure you will have a great time.
Send some Riverboat mail and pictures. We loved our cruise on the Mississippi!