Things to do while you are in Melbourne:

Queen Victoria Market - enjoy the freshly made American jam donuts, churros, cakes, breads, delicatessens and explore this iconic Melbournian landmark.
Queen Victoria Market | Melbourne's Marketplace (qvm.com.au)

Federation Square -
Fed Square - world-class art galleries and performance

NGV -
NGV website

St Paul’s Cathedral -
St Paul's Cathedral Melbourne

21 Best Free Things to Do in Melbourne (timeout.com)