Recently on the Mariner, our son had a balcony cabin with a shower only. He put a towel over the drain and filled the bottom of the shower a couple of inches to give our 7 month old GD a bath. We had a tub in our JS
cabin but he never needed to use it. I think all the showers have hand held shower heads so that should make it a little easier to soap them up and rincse. Maybe bring one of those flat pieces of rubber used to open jars and lay it over the opening. Enjoy!