It was a holiday to Sydney that the young couple did not want to end. Eden Hull, 21, and her boyfriend Blake Tindall, 27, were visiting from Ulladulla.
They spent the day at Cronulla Beach, followed by dinner at a Thai restaurant.
But the decision to extend their stay in Sydney by one more night had tragic consequences.
Ms Hull fell 25 metres from the balcony of their 10th floor room onto a tiled terrace on the second floor at 11.30pm on Wednesday. Hotel guests said the couple had been arguing in the moments before the fall.
Mr Tindall has told detectives he was inside the hotel room at the time. Police said they could not rule anything out but said that his account is consistent with other information they have.
''One of the issues we will be looking at is the involvement of alcohol,'' Detective Superintendent Greg Antonjuk said. ''There are circumstances that indicate there was a disagreement between them, but there's nothing stronger than that at this point in time.''
Ms Hull was taken to St George Hospital with critical head injuries and underwent surgery, but died early on Thursday.
Police set up a crime scene at the hotel and forensic officers were called in on Thursday. They were also reviewing security footage of the couple.
Friends paid tribute to Ms Hull on Facebook on Thursday. Stacey Judd posted: ''So tragic another young life taken way to soon! Rip Eden.''
Shantel Riddell wrote: ''That's so sad. Goes to show just how fragile our lives are. My thoughts and prayers go out to her family and friends.''
Ms Hull's death comes as a three-year-old girl recovers in hospital after falling through a flyscreen and out of a first-floor window of a house on Sydney's northern beaches.
The girl hit an awning before falling to the ground from her Elanora Heights home just before 1pm on Wednesday, CareFlight said.
The girl suffered head injuries and was placed in an induced coma. She was then flown to The Children's Hospital in Westmead after a CareFlight helicopter landed in a small park close to the girl's home. She is in a serious but stable condition.