Yeah good luck with rendering such a wave model and splashes, both with the water shader.
I'd start such a render before going on a weekend trip

Even then the result is visually inferior to the examples above.
TG isn't made for these situations.
It's exactly why non-landscape renders generally look terrible when they're rendered in TG.
Massive scale displaced terrains with massive amounts of vegetation in a realistic global atmosphere model, that's where TG (out)shines.
Anything else which requires either lots of detailed "smooth" reflections or detailed GI or a combination of both, use something else than TG instead.
I don't want to be blunt or a defeatist, but rather realistic