I've gotten the room shaped up, ran some quick tests, so far so good. Put down some placeholder furniture. The beach is basically a slope(sand) that goes down into a box (ocean). Why a box for the ocean instead of a plane? Because I'm using the mia_material's refraction falloff color to transition from nice crystal clear water to deep blue! ^^ The backdrop needs a bit of tweaking but that's small potatos right now.
The lighting setup is pretty simple, its the physical sky and a massive portal light. There are about 6-7 mia_materials, regrettably, I didn't even bother to turn on AO ><, as it would have compensated somewhat for the low FG settings, you can see that especially in the corners and up in the rafters.