Do you have to pay ?

For the Pool, If you have a Leisure Pass - $9 adult and $6 child. It's a lot more (I don't remember exact amount $20-25) if you don't have a Pass

Not if youre a Nassau county resident.

If I am a senior do I pay to get in

For residents with leisure pass, parking is free, non residents pay $10. Pool cost for non residents is $20.

Sure

I'm pretty sure pool costs are same with or without leisure pass