Opera Bar is the outdoor drink every visitor should have at least once, spread along the lower concourse of the Opera House right at the water edge. The setting does the heavy lifting, with the Harbour Bridge lit up across the way and ferries sliding past, and there is live music most evenings. It is casual and buzzy rather than refined. Come for sunset when the light is golden, expect it to be busy on warm nights, and grab a spot by the rail if one opens up.