A walk across the Cardiff Bay Barrage is a great way to spend a few hours in Cardiff. If you’re in a car then access the barrage from the Penarth end where there’s a large carpark. If you’re on foot then either walk from the Cardiff Bay visitor centre near the Norwegian Church, or catch a boat across the Bay from Mermaid Quay near the National Assembly Senedd building.
There’s lots to see, there are 3 boat locks between the Bay and the sea that operate every 30 minutes. From the sea-ward side of the barrage there’s a great view in clear conditions across to Penarth pier, Flat Holm and Steep Holm and the English coast across the Severn.