P187 CEEFAX 187 Sun 3 Apr 20:44/49       Frank Bough goes to Ravello on the last leg of his four-part tour of Italy in Holiday '88 at 1900 on Tuesday. Meanwhile Bill Buckley discovers life on the ocean wave when he joins the Eugenio C as she heads from the Mediterranean out into the Atlantic. And the programme celebrates its 20th anniversary run with a look back at viewers' favourite faces and places. Full details of all the holidays featured in the programme can be found on page 187 from Tuesday evening. BBC1 programmer 171/271