The north and west is all spectacular from the air. Some 'gotchas' to note, in the North West Donegal rarely have Avgas, unless it's changed. Sligo do and are very friendly.
Down west, if stopping for fuel avoid Galway and go to Connamara airport to the west of the Galway zone. Uncontrolled but watch out for the Aran Islands flights which operate out of there.
Kerry is so so, if there's jet traffic to be serviced you may have to wait a considerable while. Plus a complicated trip from the pumps to the office to pay, then back (though security so keep the leatherman in the a/c) to the pumps.
Kilrush Co. Kildare have a great setup, fuel available by prior arrangement, and/or of you get lucky and someone is on the field.
Many of the small fields will not be manned/personned during the week. The international airports have varied reputations. Shannon and Cork Waterford are the better ones, Dublin is to be avoided.
Weston to the west of Dublin is the main GA field in Ireland, beware of the military and Dublin zones around and get info on the Weston departure/arrival procedures.
The helicopter site finder has a list of landing sites, also try Heliair who do a trip every year. Also do a search on flying in Ireland which may through up a resource or two.
In general flying in Ireland is very laid back. Note the Irish charts do not contain much detail compared to the UK charts. You'll be using major landmarks and not minor.
Disclaimer: Not comprehensive, only lists my personal experiences. May not do what it says on the tin etc.
Have fun!