<human>: Could you distill the essence of the text into 1-3 sentences?

I booked a one-way ticket to Dublin, Ireland to depart the US on June 26.  I plan on spending at least a few weeks in Ireland before moving further into Europe to start a trip of undetermined length.

I've always been fascinated with Ireland (my last name's O'Brien too) so I've got several spots I'd like to see in Ireland and Northern Ireland.  

The problem is that these places are pretty scattered throughout the island.  The rail system hits a few of them but I haven't seen a good and easy way to make the most of my time to get between these sights (and probably  more as I do more research).

Here's a map of the places I want to visit so far: 

I'm not on any sort of schedule and don't really have any set time frame, but I'd like to get to these sights as efficiently as possible.

My final stop will be in Larne Northern Ireland so I can catch a ferry to Troon, Scotland (unless there's a better way to get over there).

The sights so far are:

* Powerscourt Estate
* Rock of Cashel Castle
* Cliffs of Moher
* Dunluce Castle
* Carrick-a-Rede rope bridge

Any suggestions on how to efficiently get around to these sights is welcome.  Also, if there's anything else I need to check out please let me know.
<bot>: What's the best way to get around Ireland to see the sights I want to see?  Also, what other sights should I try to visit?