Hi Casper,
While saying don't restrict yourself to north Arklow, don't rule it out either as it's equally as nice as the rest of the town. I would be inclined to look at the newer estates (depending on budget obviously) Knockmore, Ocean Crest, Woodlands, Meadow Vale, The Maples to name a few. Emyvale is a new estate being built at the moment too just past the Woodlands Estate. While these would be larger than the Pines they are equally as nice places to live and have good green areas and in some cases playgrounds/creches. Take a trip down some w/e or a couple of days during the week and check out the town and its estates. The town itself has great facilities such as two swimming pools and leisure centres, rugby club, soccer clubs, tennis, loads of pubs, restuarants, shops and supermarkets (including the massive Bridgewater Centre which is due to open this year).
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Best of luck with the search!