There's Sentosa (although there's alot of construction going on there now), the Singapore Flyer (Marina Barrage & Suntec City Mall is a stone's throw from it), Chinatown, Little India, the Singapore River (lots of museums there), Orchard Road...

Honestly, Singapore is so tiny that you can probably see 4 out of 5 of the above (minus Sentosa) in a day. Since Sentosa is an "island resort", you might choose to spend a full day there.

http://www.visitsingapore.com/publish/stbportal/us/home.html

PS. Just remember to savour all the different Asian cuisines when you are here. Have fun!

The Singapore Zoo and Night Safari is fun for the family speaking as a former tourist to this city state. Go after lunch perhaps arrive after 2pm and spend a leisurely time until the night safari starts. With kids and toilet breaks, snack breaks, animal shows, plus dinner you can actually spend a good leisurely 8 hours there.

I didn't enjoy Sentosa because it has a beach but it's I suspect man made and facing the port. There's also some kinda observation/communication tower you can go up but it's not that high. There's a luge and skyride and other attractions. However I found everything neither here nor there - basically you can find a better version of everything in another country but if it's your first time in Singapore and you have an extra day to spend then by all means give it a try.

When co-workers of mine used to visit from the US we used a 3-day and 5-day plan to see Singapore. For top5 I'd go with (in no particular order):

• Zoo
• Night Safari
• Asian Civilisations Museum
• Raffles Hotel
• Orchard Road (for shopping)

Below is whole plan from memory.

Note that some of these things are close to each other but not visited on the same day... just because some time in an air conditioned cab or the MRT is a welcome relief from the equatorial heat.

3-day Plan

• Day One
  • Morning: Chinatown followed by lunch at Lau Pa Sat
  • Afternoon: Make your way to Raffles Hotel and have High-tea before hanging out in the kitschy but required Long Bar
  • Evening: Take in the view of the CBD from the New Bar Asia atop the Suisseotel Stamford
  • Late: Party at Clark Quay
• Day Two
  • Morning: The excellent Asian Civilisations Museum
  • Afternoon: Orchard Road shopping
  • Evening: Night Safari
• Day Three
  • Morning: Little India sights and shopping at Mustafa's
  • Afternoon: Arab Street
  • Evening: Singapore Flyer just before sunset (about 7:00PM in Singapore all year)
  • Late: Find a good Hawker Center (Newton Food Centre in a pinch, but ask a local for a better, less touristy destination.

5-day Extension

• Day-Four
  • Morning: Peranakan Museum all about the culture of Chinese diaspora living in Southeast Asia back in the day.
  • Afternoon: National Museum of Singapore or Singapore Art Museum
  • Evening: Dinner & clubbing at St. James
• Day-Five
  • All-day at Sentosa

All the above are well recommended, but when you come to singapore, you should enjoy the food here and when you go to these places you can feel the culture and see more than what the attraction can provide you with. I have to say the varieties here are so much that you will put on weight if you have a open mind.

I would recommend: - Maxwell Market - Chicken Rice, Tapioca Pastry (Chinese) - Newton Circle - Oyster Omelet, BBQ stuff - Lau Pa Sat - Satay - Ah Moy Street - Lou Mei, Fish Soup
- Food that you have to try - Durian Fruit, Coconut Drink (tropical fruit), Laksa, Curry Puff, Roti Prata, Rojak....