The Beach

First you should look at this photo which is a pumping station and then on this one which is taken from an observation platform on the left side of the former one...

...and then this is the look to the left from the same observation platform down on the beach and Seltjarnarnes (Seal-pond-ness) - which begins on this side with the house with the red roof in the middle of the picture seen here and here.

That is a lot of links, but now you know exactly where you are, right?
On the location the picture is taken to the West.