Usually closes around dusk...3pm it will be open. are you aware that the lower parking lot is closed and that you have to walk down from the upper plateau?
As another reviewer said the lower parking lot has been closed. The walk down through the woods trail would be steep and messy if you are wearing your wedding clothes especially for the ladies with their shoes. Memorial park in Nyack by the river might be an option.
The actual park opens at 8 but some beautiful nature parts like the parking lot looking down to the water, forest trails are actually open 24
The park opens at 8am
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