Well, Snuffy did refer to the song's allusions to clues 13 and 20 actually(also clues6 and 16). The two lines, of course, being one from Bantry Bay to Derry Quay, and the other from Galway to Dublin Town.
Though the actual q13 was "Good place for viwing lunar and solar events". Galway has been identified as the answer from other considerations, but no-one has said what the clue alludes to.
    Which just leaves Q18, Millicent's favourite place. Any takers?