Mentioned by Uncovering New York
How to See the Waterfalls at Niagara Falls State Park in New York
"Unlike many other New York State Parks, there is no charge for admission to visit Niagara Falls State Park. However, there is no free parking in the area, so you will have to pay for parking somewhere either in the park or in the city of Niagara Falls. Without a doubt, the closest parking areas to the waterfalls are Lots 1 and 2 in Niagara Falls State Park."