Well I found the words myself but the Dublin place names are not yet correct.

In it was in the town of Dublin, in baliaegh a-clee [?]
They ran a great big marathon there, for the boys and girls and me
I trained for days and nights before, it nearly broke my heart
But there I was with thousands more, all lined up at the start

Come all ye lads and lasses and run along with me
Twenty-six mile marathon and a hero you will be
Radio too be there with you, get fit before that date
C'mon and run and join the fun sure the crack is only great

There was grateful men in Stephen's Green, out in that mighty throng
You'd never think that we were there to run that race along
There people from all walks of life, they came from near and far
From north and south and o'er the sea, by train and plane and car

Away we went towards Eccles[?] street, and around by Inchicore
And that's the time I was dreaming of lazy days of yore
From there to ballyfermit [?] where I got my second wind
Sure I need to get a couple more if I'm going to reach the end

Now the folks were cheering me along,I began to feel right proud
And every now and then I'd see an old friend in the crowd
Dublin was our town right then in a very special way
We were joined together one and all by the marathon that day

I'm heading for the homestrech up to the Liffey bridge
(I'd swim across that river now for the milk that's in the 'fridge)
But there's the finish straight ahead, the clock says four hours ten,
I'll be back to beat that time next year and I'll run that race again

http://images.dublintourist.com/events/marathon2005_course_map.pdf