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Again, questions come with your preferences, but here is the list you can do (assuming that you have only carry on and it is not heavy):

- Buy an MRT/Bus card (Ezlink/NETS FlashPay) at Changi MRT station (will cost you $12), add another $10 on top and take train to the Raffles place
- Walk around the area, if it is still before 10AM, go at Singapore River Cruise booth/boxes and ask them to call you River Taxi (important) to take you at Grand Copthorne Waterfront Hotel. Pay with your MRT card - it will cost your $5.
- Get out there and walk your way back to Raffles Place, walk around Marina Bay, take photos at Merlion, cross the SG50 bridge, walk around Esplanade, then via Helix Bridge to Shopper By The Bay, get in, use escalator to the very top level which goes outside, walk there and use connected bride to MBS, cross and go to Gardens By The Bay
- Got to both Cloud Forest and Flower Dome at Gardens, it will cost you $28 for both. Get out, walk to Marina Barrage, go to the roof, take photos.
- Slowly walk back to MBS, go to MRT, take Downtown Line, get out at Chinatown Station.
- Walk around Chinatown - Pagoda and Mosque streets, buy Singapore Food magnets (3 for $10) at shops at Pagoda st near exit A - they make perfect souvenirs and memories.
- Walk towards Buddha tooth Temple, get inside and see it. Cross the street and have late lunch at Maxwell Food Centre. If you see line - get in, usually it is the indication that food is good.
- Go and see Singapore City Gallery which is at URA centre next to Maxwell food court, make sure that you go there before 4:30PM - they close at 5PM.
- Walk on Neil st towards Cantonment Rd, turn on Cantonment Rd, got to block 1G of Pinnacles Duxton, pay $5 and use your MRT card to get on 50th floor of the building. If it is already around 6PM - wait and watch sunset from there.
- Go down, get a taxi and go to Fullerton Bay Hotel. Go to roof on 7th floor, order coffee with small snack (warning - coffee and snack will cost you $30 or more) and watch the light show from there.
- Get out from there before 8:20, walk back to Gardens, go to Supertree Grove, lay on grass and watch/listen Garden Rhapsody at 8:45PM.
- After all this, if you still are alive and functioning, walk to Esplanade, get beer/drink from Gluttons Hawker center, set at waterfront and enjoy the evening.
- Go to your hotel and sleep. Make sure you don't miss your flight next day.