Every year, on the first Sunday after Canada Day, thousands of people gather on an island off the shores of Turkey Point for a day of partying.
It’s known as Pottahawk Sunday, and it’s the largest boat party in Canada.
The OPP will be surveying the water throughout the day and evening to make sure everyone is obeying the law.
Every year, police say they investigate assaults and impaired drivers both on land and on the water.
The OPP has reported near drownings in the past, and scores of people getting stuck at Pottahawk after having hitched a ride there earlier in the day.