The main attraction of the day was the
Sydney Aquarium. When booking tickest on-line (cheaper) you will get an entrance time so while waiting a great place to play is the parc in Darling Harbour. Plenty of thing to climb on and the water works that engages and cools down on a hot day. Sea Life, Sydney Aquarium, with all the water animals you can find in Australia: including sharks and the incredible Dugon, where the legend has it were taken for mermaids by early European sailors arriving in Australia's waters (It did not want to be captured on photo).