As you probably know, their are no native peoples on Antarctica, so the only local customs to observe are those of the scientists at research bases! On many of our voyages to Antarctica, it may be possible to visit a research base to meet some of these modern day explorers. Only ever enter a room or building at these stations if invited to do so by the scientists, and make sure not to disturb any of the important work going on. Also, ensure you use the toilet on board your boat before arriving at the research base as adding to the amount of waste that researchers have to dispose of at a later date is considered very bad form.
Antarctica's environment is very fragile and so it's very important that no rubbish is left behind when visiting islands and the Antarctic Peninsula. Before landing travellers will be asked to wash their boots to minimise the chance of cross-contamination of seeds and organisms from places previously visited.