[1] From the car park, follow the path that heads gently uphill in a northwesterly direction. If you look carefully, you can spot the white trig pillar on the top of Sugar Loaf to the north. When you reach the corner of a dry-stone wall on your left – a four-way path junction – bear right (northeast) and keep ahead at the first crossing path to the next one (where the path ahead descends towards the valley below).
[2] Turn left and follow the wide grassy track uphill, with Sugar Loaf clearly visible ahead. At the next fork, keep right then ahead at a crossing path. Thereafter, the green path curves round to head on steadily up in a northeast direction to the summit of Sugar Loaf, from where there are glorious panoramic views of the surrounding hills – notably the Black Mountains.
To the east you can see Skirrid Mountain (Ysgyryd Fawr in Welsh), the easternmost hill in the National Park, while in the other direction the peaks of the central Brecon Beacons can be spotted.
[3] You can either head west along the top and scramble down the rocks to the path, or return to your ascent path and fork right to follow the green path round just below the summit. Afterwards, continue on down the clear grassy path of the Mynydd Pen-y-fal ridge. At a fork near the far end, bear left down to the walled boundary of the access land.
[4] Turn left along the grassy bridleway, descending towards a stream and woodland. Cross the stream and carry on up the other side along the northern edge of the woodland, then turn right along its eastern side. Before long, the path veers away from the trees, heading uphill to reach a fence (marking the boundary of the access land). Continue near the fence/wall until you reach the corner of the wall passed after waypoint 1. Staying by the wall, turn right and follow it down to meet the lane just east of Llyweddrog Farm. Turn left back to the car park.