I’m looking for advice and recommendations for Australia & New Zealand cruises in December. We are looking at the Royal Caribbean - Serenade of the Seas or Celebrity Eclipse cruises. There will be four adults and two kids (both will around 12 months old). What's the weather like in December? Did the cruise feel too long? We’ve never done more than a nine day cruise and that was before children. Also, which cruise is more kid friendly? We've sailed on RC before, but never tried Celebrity. Thanks in advance!