Paving the way for hassle-free travel regardless of where you intend on venturing out to when in Sydney, purchasing an Opal Card will be one of the wisest moves and investments that you make. Similar to London's Oyster Card, your Opal Card takes on the form of a reload facility where you can keep topping up on credit from local stations to pay for one's fares. Also, since the local public transportation network includes buses, trains, ferries, and the light rail, one would be quite foolish to not be seen making good use of the Opal Card ahead of any trip to Sydney.