Hi Joe,
I would recommend you fly into Weston aerodrome on the outskirts of Dublin, There is a bus stop right outside the gate which will take you in to the city centre in about 20 mins.
Contact my club (FlightWise) on +353-85-140-5756 who should help with cheap parking if your visiting us , which you are aren't you !!
Any other questions post here and one of us will be back to answer,
DublinPilot is also on here and may help with the routing , I usually go direct from Weston (EIWT) to Caernarfon in Wales, and yes as high as possible over the water.
Safe Trip,
Fionn