Guinness Hopstore - a moment's silence please - you are entering the home of Guinness stout, one of Ireland's most famous exports. This handsome four-storey building houses "The World of Guinness Exhibition", displaying Guinness advertising past and present. There is, of course, a bar, where you can sample Dublin's most celebrated brew at your leisure.
Howth is a pretty town, once a major port but now known mainly for fishing and Howth Castle. The castle is no longer open but the gardens (ablaze with rhododendrons in season) may be visited - and there's a popular golf course nearby.