In Singapore, are tourists required to carry their passports at all times? (Or, for that matter, any photo identification? For me, they're the same, since I don't have any other photo ID.)
This was no problem for me when I was travelling in Europe, but, here, my passport slowly is becoming deformed due to the heat and humidity when I carry it, so I'd rather leave it at home if possible.
There's a similar question here, but none of the answers actually says what the legal requirement is: they're all either anecdotes ("I was never asked for a passport") or more general suggestions ("You're usually OK with a photocopy").