opera house, harbor front or something similar, near the city area. There are lots of parks and beaches.... stay there for one year but several years ago. forget all the names liao
you may buy the day tripper (AUD15 or something) to use bus, train, ferry for one day.. very good price. I usually take ferry, then you can take a lots of pictures on the ferry. The zoo is not bad, also need to take ferry (a very short one) to reach there.