I found Shuri Ryusen last year and made a shirt for Ted. He wore it on this trip. It is located very close to Shuri Castle and easy to find. I highly recommend going there!
We each made shirts this time and had a fun time doing it. After tying the shirt to a piece of coral with a rubber band, you rub dye across it. There are many coral pieces to choose from, plus a few other things, like fish shapes and shisha shapes.