My nephew is a bit crazy about double-deckers. He has a limited transit time in SIN. I wanted to take him on a ride in one. If i knew which route had a double-decker plying, we would go straight to that bus interchange and get on it.
For sure we will visit either the Bird park or the zoo while in SIN. but beyond that, we have no plans.
We have about 6 hours in SIN, while transiting through Changi.