A magical place, rich in history: http://www.chooseireland.com/longford/inchcleraun-island/
But enjoy it for the tranquillity. You will probably share the 5th century monastic ruins only with a few curious cattle, as we did. Try and find Queen Maeve's bathing pool. Fish for perch, trout and pike. Bring a picnic.
Get there by hiring a boat from Michael Hanley's hardware shop in Ballyleague...