Town code enforcement locked the gates with my buddy's car parked inside. He had gone for a walk before sunset.
It closes at 9, they close the gate to the parkinglot. Be aware, suffolk county police will go down there and give you a hard time if you are parked up. You also have to be a town of smithtown resident to enter during the summer. If you pull up to the booth and someone is sitting there, they will ask for ID
The park closes at dusk (but you should still be able to get to the bluff by foot)
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