Caldey Island lies three miles off the Pembrokeshire coast near Tenby. It has been a centre of Celtic Christianity since the 5th Century when a monastery was established there which still thrives today. A fleet of boats runs to the island from Tenby harbour all day from Easter to October. They are strictly supervised by the Department of Transport and are owned by local boatmen, many of whom are members of the crew of the Tenby Lifeboat. Return tickets are obtained from the Caldey Island kiosk at the top of Tenby harbour. You can travel and return on any boat. The island is closed on Sundays.