There is a giant ship floating in the skyline of Singapore. That is the world famous Marina Bay Sands Hotel and Casino. The first thing on your list is to visit the bar on the rooftop, either Lavo or Ce La Vi
Singapore is home to the Flower Dome and Cloud Forest.
One of the biggest draws for people in Singapore is the cheap food at the Hawker Centers. I'd recommend checking out Maxwell, Chinatown Complex, or Amoy Street Food Centre.
Check out the Rain Vortex at the mall located right next to the Changi Airport. I'd recommend doing this first when you arrive or last before you depart.
Take a look at some Chinese Folklore. It's kind of a strange place.
You can hike around the MacRitchie Reservoir until you get to the Treetop walk. From 3-11km.
Visit the Safari on a guided night time tour. You can also check out the Singapore Zoo during the day time.
Spot Singapore's Merlion, the emblem of the city.
Future World Exhibit: Where Art meets Science
Singapore's newest and largest nightclub inside the Marina Bay Sands
pronounced Clark-KEY. This is the nightclub area, which includes Zouk, one of Singapore's premier nightclubs
Not really a street for clubbing. But tons of cocktail bars
A number of bars with a chill atmosphere and a live music scene
Not as famous as MBS, but I think has an even better view of the city.
-Laksa Soup
-Bak Kut Teh
-Kway Teow. Reminds me of Pad See Ew
-Black/White Carrot Cake
-Wanton Mee
-Popiah
-Oyster Omlette
-Mala Xiang Guo
-Kaya Toast Breakfast Set
-Durian
Try the world's cheapest michelin starred restaurant: Hawker Chan
You want to try the one in the Chinatown Hawker Centre, not the franchise across the street. Be warned, they sell out by lunch time.