A party on a sandbank in Port Hacking and the arrest of three intoxicated women in Gunnamatta Bay Park were the major incidents for Sutherland Shire police on Australia Day.
Duty Officer Inspector Michael Stuart said, overall, crowd behaviour was very good, which was pleasing, particularly given the very hot weather.
Inspector Stuart said police became aware of the gathering on the sandbank about 3pm and water police assisted shire command officers reach the party site off Lilli Pilli.
"It was a gathering of about 100 people, who mostly didn't know each other," he said.
"Due to the current health orders, the crowd was asked to disperse.
"They were co-operative. There were no arrests and no infringement notices were issued."
Inspector Stuart said there was a large police presence in the shire for Australia Day, but the day had gone off very well.
He said one exception was the arrest of three intoxicated woman in Gunnamatta Bay Park about 8pm.
All three were charged with assault police, resist arrest and fail to comply with a direction.
Two of the women were also charged with offensive language.
"The vast majority of the community were very well behaved, which was good to see, particularly given the temperatures and the number of people who were out and about," Inspector Stuart said.
"It's easy for things to happen and alcohol to be involved, but the day went off well from both sides."
Inspector Stuart said there were traffic issues around Kurnell from early in the day.
"Captain Cook Drive was closed, except to Kurnell residents, from about 9am when Boat Harbour and Kurnell reached capacity," he said.
"Wattamolla in Royal National Park was also closed about 9am."
A NSW Ambulance spokesman said paramedics treated a woman, 20, who was heavily intoxicated, at the end of Lilli Pilli Road, Lilli Pilli about 4pm.
A man, 20, was also treated after collapsing.