I wanted to know if I had a party there how much will it cost to rent the pool out for the day

YOU CAN GO TO ARDSLEY TO THE DEPT OF PARKS AND RECREATION TO SEE IF YOU CAN GET A PERMIT TO RENT THE PARK SPACE OUT. AND AS FOR THE POOL AREA YOU CAN ALSO BUY A PARK PASS AT THE SAME PLACE THE PASS IS GOOD UP UNTIL 3 YEARS

I think you need to call the county parks department... I assume you want it to your party guests alone? Not thinking they do that...

Pool don't know but pic area free

If you want a prime area just get a permit at the building in parking lot or city parks building..It usually doesn't get that crowded unless holiday.. alot don't get permits but if you want a prime spot.. concrete and new tables etc..get one... it's cheap