We did the reverse of your itinerary on the 12-22-02 sailing of the Celebrity Zenith. You may wish to read my review on this website. The highlight was the tango show at Senor Tango in B.A.. It was an amazingly wonderful evening of tango, music, great food, wonderful wine, and more. I could go on and on about this particular tango show.
The seas were smooth the entire trip. Take a warm jacket though. Many days in the low fifties with rain. Think like your going to Alaska.Feel free to e-mail any special questions.