Take advantage of the nightlife. Everythings open until 10PM +.
Clarke Quay is the place to go for bars/drinking. Heaps of classy bars and nice places to eat (Eg. Hooters
) and Ministry of Sound nightclub is there. You'll have a ball at that place, and its open for 5 days of the week.
Check out St. James as well, Or the old St. James Power station (whichever of the two its called). Was being built last year while i was there, and just recently opened (ready for my arrival next month
). It's 9 clubs in one building, all on one cover charge.
http://en.wikipedia.org/wiki/St_James_Power_Station - Gives you a quick description - Their homepage:
http://www.powerhouse.sg/.
The other popular club 'Zouk' is also worth checking out. They have a bit of a different style to MOS (which is more focused on commercial hip hop/dance). Something along the lines of trip hop, breaks, electronic, etc.
Definately don't expect a cheap night out. Only cheap thing is the taxi ride home.