Hi Lori,
Welcome to the Moms Panel! I think this sounds like a fantastic idea, and you are certainly welcome to book the couples massage with your daughter (assuming she is at least 18 years old). The massages can be done onboard at the Vista Spa or on Castaway Cay in one of their open air cabanas.
I would also encourage you and your daughter to purchase day passes to the rainforest-themed aromatherapy steam rooms and a sauna room - it's a divine way to spend a little time!
One other splurge you might be interested in are the
Spa Villa Treatments, I toured these units recently and it looked amazing! All of the relaxation and pampering of the spa, with fresh air and beautiful vistas!
My final recommendation is to
book early, as you can imagine, the spa is a popular place!
I hope this helps!