There will be a restricted airspace over Sydney Harbour for the first time on Australia Day with police asking those thinking about taking drones to the celebrations to keep them grounded.  
"Keep your drones grounded, look skywards and enjoy the display that is going to be there for your benefit," said acting Assistant Commissioner Kyle Stewart, from the NSW Police Force major events group.
"If you are inclined to deploy your drone into that airspace, know that you pose a real risk to those that are taking in the aerial displays."
Hundreds of additional police officers will be on duty across the state tomorrow to ensure that Australia Day celebrations are enjoyed safely, in a family-friendly environment.  
"Australia Day is a time to celebrate, and we want everyone to have a great time; we just ask that you celebrate safely and responsibly," Mr Stewart said.
"As with any major public event, community safety is our No.1 priority, which is why we have committed so many extra officers to work on the day."
Mr Stewart said that criminal and antisocial behaviour associated with drinking too much alcohol was the main issue that police would target.
"The abuse of alcohol is by far and above the No.1 issue for us.
"If that's what your go is for tomorrow, know that there is a very real chance that you will be spending the night in one of my cells,"  he said.
Alcohol-free zones will be in place at events and in many parks and beaches across the state.
"I urge those of you who are out in the public spaces tomorrow to be acutely aware of those alcohol-free zones," Mr Stewart said.
"We will also have drink and drug drivers in our sights; hundreds of traffic police will be on duty tomorrow, so if you expect to drink and drive, expect to be pulled over and tested."
Mr Stewart said he hoped that the night would end with police cells empty.
"We are asking everyone to exercise an extraordinary amount of commonsense.
"Behave yourselves, drink if you please but do it in a way that is sensible and enables the people standing next to you to be able to enjoy the day as well."  
Large crowds are expected at Australia Day celebrations across Sydney and road closures will be in place around Sydney CBD and Harbour foreshore from early in the morning.
Police have advised that public transport is the best option for anyone travelling into the city.