Day 1: Sentosa (do the lugee/sky lift, visit universal studios, underwater world, etc) Day 2: Shopping along Orchard Road in the day then visit Marina Bay Sands Casino. Day 3: Zoo / Clubbing (Butterfactory @ onefullerton or Zouk @ kimseng road). Maybe visit esplanade eat at Makan sutra then walk to Merlion Park / Butterfactory
If you have more days the more "optional stuff" i.e frankly quite boring compared to the ones above: Day 4 Culture / Art Stuff: Experience chinatown, Little India, Fort Silso@Sentosa or SAM(sg art museum) Day 5 Nature stuff: View from Mount Faber(nice drive for couples), Cycling at East Coast Park + Waterpark, Henderson wave
Tourist Traps to Avoid: Singapore flyer, "beaches" (sg has one of the worse beaches in the world), night safari (the day zoo is alot better)
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