Within a picturesque curve of coastline, 10 miles to the north of Dublin City and only a 15-minute drive from Dublin Airport, Portmarnock Golf Club sits majestically on a narrow tongue of shallow duneland. And as a measure of its enduring quality, it remains one of the most respected venues in world golf.   No other Irish course has been graced by so many distinguished players in a rich history encompassing a broad sweep of significant events. It is where Arnold Palmer and Sam Snead successfully followed its serpentine route through classic linkland on their way to victory in the 1960 Canada Cup. And it is where another generation of Americans, including Phil Mickelson and David Duval, secured a memorable Walker Cup triumph in 1991.   These events, along with 19 stagings of the European Tour's Irish Open Championship, reflect the quality of a searching examination across the link's twenty-seven holes.   We look forward to warmly welcoming you to play our Championship links, which are rated consistently at the top of national polls, including the Golf Digest rankings.