I've been reading as much as I can, and one constant theme is not to touch the animals and to stay a certain distance from them (although it's fine if they come to you) and obviously neither leave nor remove anything from the continent.
A few excerpts:
"One of my goals was to poke a penguin..."
"They adamantly tell you not to take rocks because if all 37,000 people that visit every year (and growing) took rocks there we would destroy the continent. I of course took rocks but I got something even better..."
Do people generally thumb their noses about the rules when visiting Antarctica, or is this an exception?