The must-see places in Sydney for a four day tour as per My Opinion

From my opinion, the top four mast-see places and must to do things should be:

1. Sydney Harbour Bridge:

You can explore the Sydney Harbour Bridge in several ways. There are walking and cycling paths across the world’s largest steel arch bridge, which opened in 1932. A thrilling experience is climbing to the top on a Bridge Climb Sydney tour. Or marvel at the mighty structure from a boat or aircraft

1. Blue Mountains:

See the Three Sisters rock formation from Echo Point Lookout at Katoomba; it’s also the gateway to many walking trails. Board the world’s steepest passenger railway and descend into an ancient rainforest with Scenic World Blue Mountains. Or get a panoramic view of the mountains from a glass-floored cable car suspended above a steep gorge.
Tours run daily from Sydney and Katoomba to Jenolan Caves. Scientists estimate limestone formations there date back at least 340 million years. Watch traditional dance performances at Waradah Aboriginal Centre in Katoomba. The Aboriginal Blue Mountains Walkabout tour starts at Faulconbridge train station

1. Skydive Sydney:

Just go there and get the services of professional Skydive Tourism Company. I defiantly sure that it will be the best experience of your life.

1. Sydney Opera House

“A building that changed the image of an entire country”
Fusing ancient and modernist influences, and situated on a site sacred to the Gadigal people for thousands of years, the sculptural elegance of the Sydney Opera House has made it one of the symbols of twentieth century architecture - a building that, to quote US architect Frank Gehry, “changed the image of an entire country.”

House History
Synonymous with inspiration and imagination, the Sydney Opera House is one of the most recognizable buildings of the twentieth century. Meet the visionaries, idealists, architects, engineers, pragmatists and artists who built an artwork and filled it with works of art.