March 2018 - We visited just two of the 4 castles. We spent the night in Caernarfon,

A bulwark of a city and the castle could be from a fairy tale, home of a brave knight. The next morning we could see the whole beauty of this town with snow covered hill in the back. We had breakfast in Bangor which I do not recommend visiting, the close by Penrhyn castle however is amazing and definitely worth a visit. We were hoping to see Beaumarais from there, but  except the outlines there was nothing to see. After that, we still visited Conwy Castles. Way more tourists here, but we bought a nice wool blanket here, made a few miles south in Tweedmill.