Traveling between Miami International Airport and the cruise ship terminal in Fort Lauderdale?

Later this year my wife and I will taking a cruise out of Ft Lauderdale. We will take a direct flight from SeaTac to Miami (there are none to Ft. Lauderdale) so we will need to find some mode of transportation to get from the airport to the cruise ship port (which appears to be roughly 25 miles distant). Short of taking a cab which would be quite costly, are there any modes of public transportation (train, bus, etc.) which could get us from the airport to the port in a convenient and efficient manner? Thanks for any information you might have.