The CityHopper is a free service running every 30 minutes between 6am and midnight, seven days a week. Cute red ferries with two floors, being the second one not always covered. I recommend you to take it either in the beginning of the morning or during the sunset time so you can enjoy from the second floor seats the mixed colours that paint the sky at those times. If you decide to enjoy this attraction take a coat with you because of the cold wind.
The service offers 8 stops: North Quay, South Bank 3, Maritime Museum, Thornton Street, Eagle Street Pier, Holman Street, Dockside and Sydney Street terminals. From the river you can take beautiful photos of different parts of the city. It can be done during the rainy days although it will probably not be as beautiful as in clear days.