We took a $5 blow up pool on the Mariner for our 8 month old granddaughter and she loved it. We also had a very nice packnplay in each cabin and the stewards changed the sheets daily. I didn't find the water pressure to be high at all. We coverd the drain with a towel, rans some water, wash and used the hand held shower head for her shower. It is only 1 week so she didn't need to play in a tub. The dining staff were very accomodating when we needed something heated. I don't remember seeing a diaper changing station in any of the public bathrooms but it wasn't a problem for us. Enjoy and make memories.