What about if I live in New York? Do I need a Wechester park pass?. And the park pass is for the pool or the only the park?

Non county residents can not get in unless they are the guest of a Westchester resident. Westchester county parks pass gives you reduced admission to the pool and if you book picnic space but the park portion (there's a little playground area too) is technically open to all. The parks pass can also be used at other Westchester county parks

How do you get a park pass

Yes

YESS YOU NEED A PARK PASS AND IT'S FOR THE POOL