You are going to visit this area, whether you want to or not. You will have to come here while you're sightseeing, travelling (Circular Quay has a train, ferry, and a bus station), going out to eat, shop, meet friends or go for a drink. All these activities can be done here.
The site witnessed the first landing of the British in Australia in 1788 and became one of the main parts of Sydney, from which the city grew bigger.
Start your day in one of the famous restaurants - Aria, Quay, Bennelong, Cafe Sydney or The Dining Room, then visit the numerous attractions around the Quay - the Opera House, The Botanical Garden, The Rocks, which are adjacent to the area, the Customs House and much more. Take a stroll through the streets, which are great for people-watching and amazing photographs, and then finally board a ferry and go for a cruise around the harbour.
You can get here by trains T1 North Shore, Northern and Western Line, T2 Airport, Inner West and South Line, T3 Bankstown Line, buses 333, 380, 392, 394, 396, 397, 399, L94, X94, X97, or one of the many ferries stopping here.
Wikipedia https://en.wikipedia.org/wiki/Circular_Quay
Address (Unnamed Road), Sydney 2000, Australia
Coordinates -33°51'39.6" N 151°12'39.6" E