Do not chew gums, which are banned in Singapore and may get you arrested. Leave them home before you travel.
Do not litter while in Singapore. Laws are strictly enforced relating to littering and you may be fined upto S$1000.
Do not smoke in public. Smoking is illegal in enclosed public places (including restaurants). Dropping a cigarette end in the street or smoking illegally can lead to an immediate fine.
Do not get involved in any drugs. Singapore carries a death penalty for drug trafficking and harsh penalties for possessions and use within the country.
Do not discuss religion or politics and do not make any joke on the same too.
Do not bring food or eat in MRT (Mass Rapid Transport) or cabs in Singapore. Offenders can be fined upto S$200.
Do not tip. Tipping is not customary in Singapore and its even frowned upon by the government
Do not connect to unsecured Wi-Fi. Better check that you “auto-discovery” setting is turned off when in Singapore. Tapping into an unsecured Wi-Fi network is considered a crime almost akin to hacking, under the Computer Misuse Act.
Do not Graffiti. Spray Painting on wall, or carving your sweethearts name on public properties or park benches or any act of vandalism such as stealing, destroying or damaging public property could result in corporal punishments.
Do not Finger Point. Visitors should be aware that pointing an index finger at someone is perceived as rude.
Do not forget to flush while using a public toilet or you may be fined upto S$150 for this offence.
Do remove your shoes while entering a private home, a temple or a mosque.
Do have coins with you when you need to use public toilet.
Do stay on the left side of the escalator. The right lane is for all those people in a rush.
Do drive on the left hand side.
Do have some handy cash ready at all times. Do not always rely on your credit cards.
Do shake hands for a warm greeting and try addressing someone using the title of Mr., Mrs., or Miss with the surname.