Hello Matteo!
Glad to hear that you're planning a trip to Ireland and that you're going to explore the whole island!
I invite you to take a look at
this article about County Sligo, where you can find some great ideas for your visits: dramatic sceneries, beaches and wild nature along with literary legacy are waiting for you there.
Also,
Sligo town is totally worth a visit and it's a lovely town to explore away from crowds.
I hope this helps! 😊
Valentina