Nan and I took a trip on one three years ago, great food and a fun time. I played cards in the casino and had a ball, river travel was never so good! You ought to try them, their a unique journey to say the least!
this is the one we rode, New Orleans to Memphis Tennessee
http://www.mississippirivercruises.com/operators/cruise_west_cruises.cfm
It would be such smooth sailing
with no fear of storms or wracking waves.
Or pirates at sea! LOL!