Is there a hot tub and is the pool 24 hr access so you can swim after all the wild kids have gone off to bed?

There is hot tub + pool. Only access during certain hours. Not 24 hour swimming.

The pool and hot tub close at 10. Their pool is almost entirely natural light so around 9pm it is kind of dark and dare I say romantic, but definitely not good for kids.

Yes

Pool closes at 10 PM so OK till dark

Yes I believe there is the time I'm not sure about but I'm sure Arrangements could be made