You need some pirates to get you back Sparrow! Ocean is just a primitive that you can put in the scene and with very few controls. The overall scene is another problem: get the right light, the right shade and render.
You can use ocean primivite with replicator to create large oceans too.
The Terrain editor let you use a image as landscape or you can paint it right in the editor.
The shore shader was done using DCG Terrain tools plugin...

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