We did 14 nights in May only 6 on campsites.
Of the others
1 was wilding at Hook Head Lighthouse
2 was at the Aire at Askeaton
3 was wilding on the car park at Leenane
4 was at the Aire at Crossmolina
5 was at Millar's pub & restaurant near Athlone - great food in the restaurant and lovely pub *
6 was in car park outside Cusack Park, Mullingar
7 was at Jas Manzor's pub in Clane - another great pub *
8 was at Howth Harbour
I'm not sure I'd like to park up in some lay bys - just a little too close to traffic sometimes, there are plenty of other places a little less exposed.
*at both pubs we just asked if we could park overnight so we could have a drink without worrying about driving afterwards and both said yes without hesitation.
The dinner at Millar's was really good and great value, they even did us a fantastic breakfast the next morning even though they weren't actually due to open until noon.