This came up over the controversial opions thread, but deserves its own thread.
Some ideas here. She is athletic, competitive, and sporty. Not the person who sits in the audience, but who actually is out there playing or competing. Of course, she is well aware that her training and abilities leave most competitors in the dust, but I can see her participating in equestrian sports or having organised a sports league with traditional Themysciran games within the Justic League.
I also interpret her as an avid reader, especially poetry (in my headcanon Sappho was an Amazon who was outside Themyscira on a mission when Heracles took the Amazons into slavery, and thus were not part of the split between the Themyscirans and the Bana-Mighdall). I'm sure she has tried her hand at poetry, but with which success I have no idea. I can see her being an enthusiastic jury in a poetry slam.
Her education definitely would include music, but I'm not sure it would be a primary interest. Likewise with cooking (and her idea of festive cooking starts with "go out and hunt") and gardening. More likely she has a gardener (possibly as an extra duty for Ferdinand) she works closely with and assists at times. Some basic handicraft would be a possibility, like knitting, lacing, or embroidery. Or wickerwork.