Singapore hardly sleeps at all and it seems you can go out at almost any time and find thousands of people around. There were a lot of police around but we were approached by some shady characters who promised a special good deal just around the corner late at night - we were pretty sure their special good deal consisted of robbing us blind - literally - so we stayed on the main drag where you are very safe.
Singapore has some very strict laws so be on your best behavior unless being cane on your rear end has some sort of sick appeal to you - though be warned people have died from this punishment, or maybe it was the heart attack from the accompanying huge fine, either way don't be stupid, don't spit or do anything you think is a huge laugh in an intoxicated state.
Attractions 
Recreation