Hi! We will be staying a few days in Katoomba in March, and coming into Sydney on a Saturday morning, dropping off our carryon bags at Meriton Kent St and then spending the day in Sydney (Opera House/Manly Ferry etc). Should we just take the train straight into Central Station or change (at Olympic Park?) to the Parramatta ferry and get off at Darling Harbour for the views/experience? We only have the one day in Sydney (fly out on Sunday) so want to make the best use of our time. If we do change to the ferry, how do we get there from the train and how much longer is the journey? If it makes a difference, we will likely use the Opal card to get the $15 rate for the day. Thank you!