On a serious note for a moment
The back massage is always good, but usually hardest to get as they get booked first.
The maintenance facial is very relaxing, and for a man (well me anyway) it's something I would not have normally.
I tried the manicure once, and I'd give that a miss in future. My wife loved it when she was in, so horses for courses.
A haircut is more useful than a treat. I had one last week out of necessity and convenience.
The advice about getting there early is spot on. If you want complete choice you probably need to get there 3 hours before departure.
Enjoy whatever you have.
Martin