Dunn River Falls is a great tour and a popular one, but as Penny said it is better if you do it from Ochos Rios. From Mo Bay its a very long ride to the falls over some very rough roads. It would consume your entire day and it is much more expensive because of the travel involved. Also you need to be in pretty good shape to climb the falls. They claim you can climb at your own pace but when we went they were basically putting people in a conga lien holding hands and dragging you up the falls. It wa fine for us but we had my mother in law with us and she has very weak knees and had to bail from the climb about half way up. I was exhausted from lifting her up to the next rock....
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