With the opening of the new parkway, the Long Island Parks Commission expanded Sunken Meadow State Park to handle the additional traffic. The commission added four new parking lots, which brought capacity on the parkway from 3,000 vehicles to 7,500 vehicles. A new overlook was constructed, which also had the capacity for 1,250 more vehicles. A new cafeteria, extensions of the then- boardwalk another , along with other new facilities valued at $1 million (1957 USD) were also constructed. These expansions brought the size of Sunken Meadow State Park to with of beachfront.