Starting at The Pandy Inn or the small car park opposite, follow the north-east road out of the village, then up the fields to Arthur's Stone. Keep looking over your shoulder for views of the Black Mountains behind you. This is the only significant uphill on the route so you can relax after reaching Arthur's Stone. Take a moment to stop at Arthur's Stone and read the information boards.
Turn left onto the road but then almost right very shortly afterward, over fields and down a hill onto another country lane. Follow the lane up to a left-hand bend where you'll walk straight on to follow a bridleway. The bridleway (boggy in places) takes you all the way to the ridge of Merbach Hill where you can take in the best views over the Golden Valley.
Walk south then follow the hedge line to the road. Shortly after joining the road take the footpath sign to the right. Follow this footpath all the way back to Dorstone. After dropping down the hill there's a farm. The footpath takes you through the farmyard, but there's also a (subtly) signposted diversion if you prefer. Just before reaching Dorstone you cross over the old Golden Valley Railway which ran from Hay-on-Wye to Pontrilas between the early 1880's until the mid-1900's.