We found the Discovery Museum, which has lots of interactive displays and artifacts dug up from the site. We then headed to the Harbour Bridge. You can actually climb up the pylons (all 200 steps) You get a pretty good view from the top.
After all of this the hunger pains started to kick in. Once we finished at Maccas, we stopped off at the Apple Store. The kids had a blast playing with the iphones. I took a video and uploaded it to youtube from the store
All in all a great (and tiring) day. All the photos are here.