My wife got two birthday cakes, not sure how that happened. One at the specialty restaurant two days before her birthday and another one in our cabin on her birthday, with a bottle of bubbly.
Shorts and tee shirts weather to gale force winds with everything I brought on. Just take a lot of layers and you'll be fine. There were only a couple of us out on the deck after a while at the southern tip of SA.
We did a Christmas/NY cruise around south america. There were a lot of people and kids from Spain, I wasn't expecting it. They were all great kids and had a really good time from what I could tell. That was really a great cruise.