Guided Tour activities in South Wales
You'll need at least half a day to do justice to St David's Cathedral. In July and August there are 90-minute guided tours at 14:30 on Monday, Tuesday, Thursday and Friday; at other times, tours can be arranged in advance. The one led by the dean himself, a history and archaeology scholar, is recommended.
Guided walks of Tenby's historical sites are run by Town Trails. There are 1¼- to 1½-hour walks, with themes such as ghosts or pirates.