Robert Moses State Park was closed to additional visitors by 9:45 a.m. and Jones Beach was filled by noon, according to George Gorman Jr., regional director of the state's Office of Parks, Recreation and Historic Preservation.
Lido Beach West also reached maximum capacity, officials said.
Gorman recommended Heckscher State Park in East Islip, which had light attendance as of Sunday morning.
The Associated Press contributed to this report.
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