Welcome to the site.
Try doing a search for fishing in Kilmore Quay lots of charter boats operating from there, good fishing and not too far to drive from Arklow.
If you want to venture further afield google Cork Angling Hub and even if the weather goes against you there's still good fishing within the harbour.
Don't know much about charters in Galway but google is your friend.
This is a busy time for charter skippers so will be difficult to get a couple of spaces but start making arrangements now.
Hope this helps a bit and good luck --- enjoy
Yappo