Atlantic Flight Training in Cork have a fleet of 4 C172. The rate is €165 per hour. You will probably need a hour or two for a checkout depending on experience and how current you are. You might have trouble getting use of one for touring though as they are usually booked up. Hope you have included landing fees in your budget, last time I was at a certain regional airport in the west it cost €12 for T&G, €20 for a full stop and €6 to enter their control zone even when not landing there. But then again most of the smaller airfields don't charge anything and are very welcoming and most of the country is Class G airspace
