I was there last September.. Seek advice on where the better bike paths are. . I didn't find them.. We saw a few cyclists about. Sure looked dangerous to me with the narrow shoulders, blind curves, and busy roads.. We stayed in West Ireland this time. Limerick south towards the Ring of Kerry.. Considering the roads I saw, I would not bike there..
Maybe there are better areas to cycle. I didn't see them. But, if you aren't cycling- it's a great place to vacation..