I have a problem with the Eu Yan Sang hint.
from searching maps, and the Eu Yan Sang (EYS) Website, I can only
find a few shops that are visible from the buses.
EYS @ South Bridge, Marine Parade, Jurong East are visible from
buses. After seeing the South Bridge Branch and Jurong East Branch,
when the bus turns left, there is no hotel at the first bus stop.
At JE, it turns into the interchange! Only the one at Marine Parade
stops outside a hotel, but one will only see the EYS after the
first bus stop, and not before.
the rest are either in shopping malls, (which are obviously not
visible, since most of them are in the basement), or the shops are
not adjacent any roads, therefore they are not visible.
Are my assumptions wrong somewhere? Pls enlighten! 
