Matter of personal opinion really. But probably Royal Portrush, Royal County, Lough Erne, Malone etc. There are a lot of brilliant courses.
'Royal County Down' in Northern Ireland, is the best in the British Isles. However if you only meant the Republic of Ireland it is 'Ballybunion'.
Yes, Ardglass is a links course. And a very good one at that.
Yes, there is an 18 hole par 3 course at Blackwood Golf Centre, near Bangor.
MD Golf clubs are amde in Northern Ireland
For American enthusiasts, one can find golf stores online at American Golf. In Australia, one can find them at Aussie Golfer. In Northern Ireland, one can find them at Uniquely Northern Ireland.
Bayview Golf Course in Kaneohe reopened it's mini-golf course.
The Portmarnock golf course was establihsed in 1894, and is located north of Dublin. Its address is Golf Links Road, Portmarnock, County Dublin, Ireland.
There are many good golf courses in Ireland that you can play on in the classic south west they include 'Kikllarney' 'Adare' and 'Cork Golf Club', in Dublin and east the include 'The K Club' and 'Druids Glen' and in Northern Ireland there is 'Malone' and 'Belvoir Park'
Doral Golf Resort -- Blue Monster Course
No, golf courses don't close on rainy days, unless the course becomes unplayable - flooded greens etc. I live in Northern Ireland, if I only decided to play on good days, I'd never get to play.
Kapalua. The Plantation Course.
Glasgow Hills Golf Course in New Glasgoe