Re: things to do in SIN:
Eat: You've got to try some of the local food. Like the chilli crab at a seafood place on the east coast, the roti pratas at many local coffee shops (pancake-like pieces of dough dipped in curry) and durian, an exotic fruit with a spiky, olive green shell and a creamy flesh wrapped around seeds. You could either love or hate the latter, but it's definitely an experience - possibly, to be enjoyed on the roadside in Geylang, the closest you'll get to a red light district.
Shop: The main retail drag is Orchard Road, where you'll be able to find all the international luxury brands as well as lower-priced apparel. If you're in the market for electronics, you could get a bargain (remember to haggle for a lower price) at places such as Sim Lim Square or Lucky Plaza.
Drink: Tea, coffee and cocktails. Indian and Chinese coffee shops (these are casual roadside establishments dotted around the island and are clean, hygienic) have a different take on coffee and tea. Coffee's served strong, and you can add condensed milk or sugar to cushion its bite. Tea, or teh tarik, as they call it in Indian coffee shops, is milky, sweet and comforting - ideal to wash down a roti (the bread I mentioned previously.) Also, there are plenty of bars around the city. An institution is Zouk - a club with four venues to pick from: a wine bar, a techno-style dance floor, a trip-hop room and a more mature, chilled out space. Newer, more popular places include Thumper, at the Goodwood Hotel, and Attica, at Clarke or Boat Quay.