I believe its too early. The airport is 40 minutes from the terminal if there is no traffic, but all it takes is a slowdown on one of the bridges and you're in trouble. Why put extra pressure on yourself to get off the ship?
Take an afternoon flight.
Better yet stay for a few days and spend some money here.
Happy New year
February 1998 - HAL Westerdam E. Caribbean
January 2000 - Carnival Ecstasy - Mexican Riviera
February 2002 - Costa Atlantica - W. Caribbean
February 2004 - Grand Princess - W. Caribbean
March 2007 - RCI Voyager of the Seas - E. Caribbean
May 2007 - RCI Voyager of the Seas - Western Mediterranean (Mrs. E. & daughter only - I had a medical emergency)
October 2007 - RCI Adventure of the Seas - Southern Caribbean