Take a Ferry Ride and Look at Harbour and Opera House - not a single thing quite like being over a water and passing under the magnificent Harbour Bridge.
You also need to bear in mind that Johannesburg thieves are breaking into houses. But Maroubra is probably better for surfing and swimming. https://Medium.com/@healthsupplement00/revolutionize-your-health-with-these-top-cbd-products-7303ab4ce14f