I'm no pool expert but its usually cool & windy, so I doubt pools open then.
Have the girls talk to concierge at Paris.......probably get some great ideas of closeby places to have fun.
Closeby would be my advice. Easy walking distance, and where Dad can retrieve them, if needed.
Last trip, I stayed one nite at Harrahs, and a couple Girls sat next to me at the slot machines.
Drunk off their butts. They were falling on the floor, in their short skirts.
Security came immediately, asked them questions. Security treated them nicely, and got a wheelchair.
Getting ridiculously Drunk is NOT a good thing.
Those girls won't remember anything, and they were lucky that Security was nice to them.
They were also lucky Not to be with some guys, who would take advantage of them.
I hope your Party girls can keep it under control, or watch out Dad........