TheArt Studio (forward port side Deck 11 - Observation Deck adjacent to The Crow's Nest) offers the opportunity to create art or crafts including origami, knitting, calligraphy, watercolor painting, painting on canvas (additional fee charged), creating designs from doodles, or even coloring for adults.
While all the needed materials are provided, most of the "instruction" is via video, not from a live instructor.
Even so, it's an opportunity to learn or try something new and stretch your artistic or crafty muscles.