1.Taronga zoo, suggest to take ferry at circular quay, so that can enjoy the nice harbour view and sydney opera house
2. If you wanna go water park, you can go wet and wild
3. lunar park, free entrance, pay at each rides or games, like AIA carnival
4. Sydney Aquarium
5. blue mountains, cable cars and hiking trial
6. bondi beach
in aussie, better stay in meriton serviced apartments, u can find in most places, including sydney and gold coast