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Sydney's tallest building, the Crown Casino, offers free guided tours of its 83rd-floor observation deck perched 250 meters above the harbour, with great views towards the Opera House. The catch is that there's exactly one tour at 8 AM on weekdays only, with capacity for just 10 people. Tickets for the following week are released every Monday and are usually snapped up in minutes.
Crown Sydney is a skyscraper in Barangaroo, New South Wales, Australia. Designed by WilkinsonEyre, it stands at a height of 271.3 m (890 ft) with 75 floors, making it the tallest building in Sydney and 4th tallest in Australia. It was developed by Crown Resorts, primarily comprising a hotel and residential apartments, while a casino and other hospitality venues make up the rest of its floorspace. Construction began in October 2016, and the building was topped out in March 2020. It was inaugurated to the public in December 2020.
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Two floors of internal exhibits, outlining the maritime role in Australia's history. Houses significant full scale exhibits. Outside there are ships and submarines to explore.
A massive aquarium. In addition to various display tanks (penguins, platypus, various fish species), it has three underwater walks where visitors walk in glass corridors underneath and between the dugongs, sharks, rays and tropical fish. There is a 2-minute "penguin ride" in a small boat, heavily advertised but underwhelming. Consider going on a weekday evening, to avoid some of the crowds.
It features a variety of personalities, mostly Australians such as Hugh Jackman.
If you don't have time to get out to Taronga Zoo, then this offers the chance to see Australian wildlife close to the city.
Sydney Maritime Museum Ltd
The Fleet restores and operates a number of historic vessels including the barque James Craig. In 2003 the International Congress of Maritime Museums gave the James Craig the Maritime Heritage Award. The offices, model workshop, some displayed boats, and the library are on Wharf 7 located in Darling Harbour. The James Craig is alongside the wharf.