Drink driving laws and penalties apply to anyone regardless of what you drive or ride. Play it safe, take a taxi or call a friend if in doubt. 2 beers might be enough.
"The legal limit in Singapore is 35 micrograms (ug) of alcohol per 100ml of breath.
Under the law, first-time offenders face disqualification from driving for at least a year and a maximum $5,000 fine or six months in jail.
Motorists can also be charged with drink driving even if they are under the legal limit, as long as they do not have proper control of the vehicle."
This is on top of any civil action you will face when causing an accident.
Source: Road Safety Counsel