if you get a good photographer, he should be able to work with many of the scenes in singapore. good idea to get some night-shots as well, they add variety to you wedding. Now is christmas time, orchard road is a great place to take your wedding photos, if you dare to take them on orchard streets.
the effects they can do with the lights are pretty cool, i think it's called bokkeh if i'm not wrong. (blur out the background lights and focus on the couple)
other nice wedding photography places i can think of are:
-mount faber (can have dinner at jewel box!)
- sentosa (choose the area which is clean so that the pictures won't have dirty stuff in the bg)
- chinese garden (great for cultural kind of shots)
- singapore flyer (awesome scenery at the background when you are in the capsule, omg!!)
- railway station at CBD (like those korean railway shots ^^)