Our last day at Wellfleet , we arrived at the bay at Duck Harbor and it was still several hours to high tide. The beach was a bit rocky but the children enjoyed the sand . A huge castle was built , the sun was setting and the tide slowly rose and a tidal river was arriving to overtake the castle. Much whoo and hollering arouse as the castle was flooded! Cheers came from onlookers! Beautiful evening , goodbye bay goodbye cape Cod , till next summer.