where, in nyc is there a hotel or some other resort type place where one could swim and or enjoy a hot tub all hours of the night. thank you. this is very important and requires immediate response. 
Considereing the DAY I would say so.
Try a Hotel booking web site and see if you can sort by ammenities such as hot tubs, pools, etc. Start with Google and putz around until you come up with something.
Since you`ll be making phone calls to confirm and reserve you may be on your own here.