Singapore is a city of contrasts, a nation of ideas and innovation and one of the most popular and vibrant destinations in ASEAN. Moreover, this city state is the cleanest.. safest and most efficient city in ASEAN cause of the strictly enforced laws. tf you want to travel to this country you must know these five 'Do Nots" for travelling in Singapore. 1. Do not chew gum, which is banned in Singapore and may get you arrested. Leave it at home before you travel, 2 Do not smoke in public Smoking is illegal in enclosed public places. 3 Do not discuss religion or politics. Do not make jokes about them either. 4 Do not point at someone with your index finger, which is considered very rude. 5 Do not tip. Tipping is not customary in Singapore and it's even frowned upon by the government