Plenty! There are regular boat trips in summer to Inchagoill island on Lough Corrib, while the best known Irish inshore island might be the lake isle of Innisfree on Sligo's Lough Gill, immortalised by WB Yeats in his poem of the same name. Roscommon's Lough Key has several islands, the most prominent being the privately-owned Castle Island. Trinity island is more accessible to the public - it was once occupied by Cistercian monks from Boyle Abbey.