We'll be on the Voyager of the Seas at the end of May going to Nice, Florence, Rome, Naples, Sicily.
From reading the reviews it appears that you have the right idea in trying to organize your own tours. We'll probably do the same although I have nightmares about getting stuck in a traffic jam and missing the ship.
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