The Celtic Trail
This is the western section of the Celtic Trail which uses long traffic-free sections between Swansea and Fishguard in south-west Wales. The route is coastal in nature and after 75 miles alongside the sea it heads into Pembrokeshire National Park which initially heads inland but the route always heads back to the coastal villages and towns.
For families cycling with small children, there’s a fantastic traffic-free cycle section along the Millennium Coastal Path which begins at Swansea and goes west for 30 miles and is almost all traffic-free cycling. This is a real highlight of the route before it enters Pembroke Coast National Park's cliffs, beaches and the usual disused railway lines. The Celtic Trail is typically diverse and like all the other long distance cycle routes the journey will be memorable and different for everyone. It's a primarily safe route, especially the safe and busy Millennium Coastal Path, and if you have a full week then you could include the eastern part of the Celtic Trail on your bike trip and head to Cardiff and the English border. That section looks tougher though. Less sea, more hills. But you'll enjoy it whatever the mileage and the distances your bike takes you. But don't hurry. You need to enjoy it.