tub in shower-kids can splash and swim as much as they want! This is a brilliant idea for adults too. Whenever I take a bubble bath I end up wanting to shower off at the end. This way you can just step out of the tub and shower off.
My soaker tub is set up identically to this. Instead of my wrought iron shelf, I would love to do a built in. I've also been torn with beadboard vs. tile for the front of the tub. Turns out I love the beadboard and its cheaper!