See the Sydney Opera House: In terms of Australian icons, is perhaps the most recognisable symbol of Australia. Its unique, sail-like design and postcard-perfect location at beautiful Sydney Harbour make it one of the most highly photographed buildings in the world.
Visit Sydney's Beaches: As the birthplace of Surf Life Saving, Sydney has a strong beach tradition. Many of Sydney's beaches are among the most famous in Australia simply because of their connection to the city - places such as Bondi, Manly and other areas.
Visit the Three Sisters in the Blue Mountains: One of the most treasured nature-based destinations in the state of New South Wales, the Blue Mountains continue to be the destination of choice for those looking for a single or several day escape from the city. The Blue Mountains region is also rich with a bevy of native Aussie wildlife.
Cruise on Sydney Harbour: As one of the best possible ways to explore one of the world's most beautiful harbours. There's everything from dinner cruises, speedy jet boats, romantic sailing tours and vintage tall ship adventures to whet your appetite.
Source: http://www.sydney.com