If you are driving to Builth Wells, there are several routes you could take depending on your starting point. From Cardiff, take the A470 north towards Brecon and then continue on the A470 until you reach Builth Wells. From Swansea, take the M4 towards Cardiff and then follow the directions as above. From Hereford, take the A438 towards Brecon, then the A479 to Builth Wells.
If you prefer to travel by train, Builth Road station is the nearest railway station. From Cardiff, catch a train to Aberystwyth and change at Llandrindod Wells. From Swansea, take a train to Shrewsbury and change at Llandrindod Wells. From Hereford, take a train to Llandrindod Wells and change for a train to Builth Road.
If you want to explore the surrounding area, the Brecon Beacons National Park is an easy drive from Builth Wells, as is the market town of Hay-on-Wye. You could also head west to visit the Elan Valley, a stunning area of natural beauty.