What do you want to photograph? I just left Singapore yesterday. There are some interesting markets. China town is Ok, but too many tee shirts and plastic trinkets for westerners. I found the markets near Bugis (not the ones in the building, but the open air ones) a bit more interesting. There is also some temples in amongst that lot (but be cautious and respectful of 'no photography' rules). They appeared to be more vibrant on the weekend.
For scenic views, anything across Marina Bay should be good. If you want to shoot night time shots, the laser and light show can make interesting images. From our room in the Swissotel, looking across the bay, with the theatres in the foreground, it had a 'War of the Worlds' feel (but I confess, I did use d..ital for those shots).