I guess some people associate 'beach' homes with weatherboard cladding, inside wall panelling, and wooden floor boards to give that relaxed vibe. I personally thing stone would also look effective and require less maintenance in comparison to the wood. Remember, sand has a tendency to scratch floorboards, therefore, over time, it may require some TLC to restore to original condition. Stone would simply require a vacuum and mop and would give a seamless look to the home.

Our last house and our current house both had wood floors and lots of wood furniture. Using area rugs (I've got a weakness for oriental rugs) provides separation between the floors and the furniture. And if the walls are light, as in LesleyH's photo above, you will certainly not feel overwhelmed with wood. The only time there's an issue in my mind is when the walls are also wood clad - that can be a bit confronting and needs management.

R u laying boards over the concrete or beside?

The knots look like pine to me. Is that raw timber or does it have a coating? A trip with the pic to the timber shop would be a good bet.