They may have been referring to the recent Nickelodean cruise. It was a special sailing. Royal Caribbean is a good choice for children anytime though. They have special activities for all age groups. The Voyager class and Freedom class ships, and new Oasis have more activities than their other ships. However; all their ships will offer activities. They also have a new Family Time Dining program which allows the children to eat within 40 minutes, then they are whisked away by the Youth crew and the parents can continue their dining.
They don't have 3/4 night cruises for Bermuda but they do have Bahama & Caribbean 3/4 night out of Port Canaveral and Miami. Also 4/5 night out of Fort Lauderdale for the month of June 2010.