It's not coincidence that cruise ship employees seem to be smiling all the time, they are trained to do it.  Not like a dog does tricks, but through a program called "Share a Smile" at Carnival for example, everyone is involved. This program renews thier commitment to great customer service and reminds them how much difference a smile can make.  This was really obvious to me from the time I entered the terminal in Miami to board the Victory.  Everyone was always nice, but now they just seemed more genuine and really into it all.  And its just so true, a smile surely can make all the difference in the world.