That shot was taken at Botany, Bare Island Fort.
It's a top location, very, very busy though. I drove around for 30 mins trying to get parking. I eventually parked in an emergency entrance, so I could only spare a few minutes to take some pics.
Glad you think they're postcard quality as that's what i'm aiming for. I just purchased a high quality general purpose lense so it was a good oportunity to give it a run. I'm happy with the results
PJ, Yeah i'll keep away from that spot. Hyde park had me looking over my shoulder a bit at 1am on a Sunday morning dodging pissed people with camera bag and a tripod.
For those that are interested the bridge shot had a 30 second exposure and the Opera house was 30 seconds.