Buy tickets and join the crowds at a game at Sydney Showground Stadium. If there's nothing happening while you're in town, you might like to check if they give a guided tour of the facilities.
This sporting facility is in Sydney Olympic Park, a place that has plenty of things going for it! Sydney Showground, Accor Stadium, and Qudos Bank Arena are other fine sightseeing opportunities close by when you're done at Sydney Showground Stadium.