This is an interesting question and I read some pretty crazy answers, though I have traveled extensively.
这是一个有趣的问题，并且我也阅读了一些相当疯狂的回答，尽管我游历众多。

Brazil
巴西

1)Don’t make the ‘Okay’ hand gesture
不要做出OK的手势。

2)Don’t flaunt your wealth in Brazil as the crime rates are very high and it is better to be safe than sorry.
不要在巴西炫富，因为巴西的犯罪率非常高，所以对比感觉自己低等，安全更重要。

Australia
澳大利亚

3)Don’t climb Australia’s Uluru Rock because it holds deep spiritual significance for the local Anangu people.
不要去攀登乌鲁鲁巨石，因为它承载着当地乌鲁鲁人的精神意义。

4) Don’t underestimate the distances in Australia – remember, Australia is a single country housed in a continent that is almost 60 times the size of England.
不要小瞧澳大利亚的疆土，请记住，澳大利亚是唯一一个拥有一个大洲的国家，领土相当于英国的60倍。

China
中国

5) Don’t create a scene in public in China
不要在中国的公共场合闹事。

6) Don’t let someone else pay the bill without fighting for it
不要在没有争相买单的情况下让某人买单。

Some non-obvious things that can get you into trouble in India:
在印度某些不起眼的小事可能致使你陷入麻烦：

Kissing in a public place.
在公共场合接吻。

Touch anything of respect with your feet.
用你的脚去碰任何带有敬意的东西。

Physical contact with member of opposite sex.
肢体接触到异性。

Disrespecting any religion.
对任何宗教不敬。

Shorts/skirts in a place of worship.
在敬拜之地穿着短裤或者短裙。