I would suggest you rent a car and look for a suitable chapel. There are some lovely ones out the countryside, especially in the West of Ireland. You won't find any info about these on the internet but you wouldn’t really need to book them in advance. The west of Ireland is beautiful, much nicer than the east(where I'm from). The countryside is just amazing. Most people who come to Ireland come to Dublin and don't travel much further. Not a good idea, if you've only time to visit 1 city in Ireland make it Galway, much nicer and friendlier. Hope this helps, enjoy your trip.