Our first trip to Ireland was using train and bus exclusively. While in Belfast, I found the Titanic Museum and the Ulster Folk Park and Transport Museum interesting. The Hop on Hop off bus in the city is a nice way to get bearings. We used Rick's book for helping plan sites. Bushmills is a great place to visit the distillery and the hotel there looks really nice (we were just visiting for the day). Also, we enjoyed Derry since both my husband and my family roots are from that area. We stayed in a BnB just outside the old walls which was close enough to walk just about anywhere. Only problem we had was that we go on the shoulder season and that year we went early September- the bus times had changed the week before and we ended up having to walk 5 miles that we hadn't planned on. So be sure to check on seasonal changes - I think it was the Rambler that dropped a couple routes after season was over. We've rented a car since but I do enjoy the trains.