I love living in Dublin and discovering things about the city. I write about all the cool things I come across in my blog.
I'd definitely take the 747 bus ... but ... where are you going? A lot of places are served by Bus Eireann (the national bus company) or private operators which you can get directly at the airport and save yourself an hour travelling across the city. See More
The Irish Landmark Trust maintains and lets period properties in Ireland. The only place they have in Dublin is a Georgian Townhouse in Temple Bar. Have a look here: http://www.irishlandmark.com/property/georgian-townhouse/ In terms of hotels, The Shelbourne... See More
Another vote for Trim Castle, great tour. I also liked Cahir Castle and if you visit there you must also take a walk out along the river to The Swiss Cottage. If you want to get off the beaten track a bit Drimnagh Castle... See More
To get a good overview of the city of Dublin I'd recommend taking a HOHO bus tour. If you're interested in history then Kilmainham Gaol and Glasnevin Cemetery are definite spots to visit. Personally... See More