This is the little grove on the southwest side of the town lake where my father says he used to go with his childhood buddies for summertime picnic adventures. The trees, probably not much taller than he was fifty (ahem!) -odd years ago, have matured beautifully.
If you love old things and measures of our ever changing world like I do, you'll enjoy visiting the Reykjavík Museum of Photography website. The photo that I've linked shows an overview of the town lake, and from the very barren patch in the lower left hand corner of that 1919 image the lush little forest shown above has tenaciously emerged.