noun
spa
SPAH/spɑː/
A place offering treatments for health, beauty, or relaxation.
The spa offers a relaxing shoulder massage.

Etymology
The “spring” connection comes through the Belgian resort Spa, whose mineral waters were believed to heal. Its name broadened from a medicinal spring to an establishment offering health and beauty treatments.
In context
Sea days are perfect for pools, hot tubs, shows, trivia, and just wandering the ship. This is also a great day to book spa treatments