Short Answer: Yes.
Long Answer: Just like the workout facilities, the spa facilities should be available to you in the same manner as they would be on a traditional cruise.
That means if you’re interested in a facial, massage, haircut, or any other treatment, you can simply visit the onboard spa and make an appointment.
The services and hours of the spa depend on the ship.
Using the spa could be a great way to take a break (who takes those?!) from the madness!