Look for packages from companies like Great Value Vacations, Celtic Tours World Vacations. since many historic castles and estates have been transformed into luxury resorts. The Adare Manor is one. Stay at the Adare Villas, which are well-located for exploring sites such as the Cliffs of Moher and Ring of Kerry. This offer from Great Value Vacations includes: Roundtrip, economy class airfare to. Kids ages 17 and younger sail free…