You have to disqualify all the bigger landmasses as continents, and ignore the possibility that Greenland might actually be three smaller islands connected by an ice sheet. But what about the world's smallest island? Would every single pebble in every single mud puddle theoretically be a contender? What makes a real island?
Don't expect everyone on the planet to speak English. Leave a tip. Know that things will go wrong, and when they do go wrong, try not to yell at whoever appears responsible. These are hard-and-fast guidelines that travelers should know and follow -- and that we've probably all heard before. Is there anything new to say on this matter? I think so.