Ah, I guess Choa Chu Kang with all the farm can do the trick. Of cos, if u want a really morbid photo, try the cemetry (ok, ignore me. That's my crazy side talking again).
Seletar Camp too. The main guardroom is gone now. I believe u shldn't have any problems with shooting inside. But den apply the principle of shoot and scoot. There's this large, very nice field at the road along to West Camp. Once u enter the camp, u'll see a roundabout they call 'Picadally Circle'. Go left at the junction, and go left-left-left all the way until u can see a long stretch of road with a wide field on the right side of the road.
It rox for those outdoor shoots.
But take note its raining these dayz, so the bride might be aghast at the idea of enduring mosquitos, snails, and all da creepy crawlies on the field.