How much will it cost per person

You need to buy a park pass to be able to go in im pretty sure its $45 and its good for3 years you can use it anywhere in Westchester

It depends if your from Westchester county.. the price goes up if your not.. but if your not gonna go more than twice ya best bet is just pay daily price.. it's 7$ all day price goes down after 4pm

Yes u do

YOU HAVE TO FIRST PURCHASE A PARK PASS