When you get out in the rural areas almost any farmer you meet will give you permission to camp in his field. Fortunately Ireland is not plagued with the type of liability lawsuits we have over here so people are still happy to let you camp. I would ride all day and as evening approached I would find a farmhouse and seek permission to camp, I was never turned down and was often treated as an honored guest. My father often let bike tourers and backpackers camp in our fields or barns. He would always ask them about their trips and home countrys. You will find that it is exciting for the rural people to have a visitor. Just make certain you are a good ambassador for bike tourers.