Llyn Brenig is an impressive body of water but the adjacent conifer forests and Hiraethog moors are just as imposing. Numerous walking routes are possible here but most first time visitors will focus there attention on the huge dam feature which blocks in the southern end of Llyn Brenig reservoir. The views from the dam are superb; there is a real sense of a landscape opening up before you. If you are short on time then quick circular walk based around the dam can be done. If you have more time it is well worth continuing southwards along Afon Brenig to Pentre-llyn cymmer and then along the banks of Afon Alwen to Caer Ddunod. Here there are the remains of an Iron Age fortification. The return route allows a view of the Alwen reservoir dam, a far more attractive structure than the Brenig dam.
Other key walks at Llyn Brenig include a lengthy (16km) circular trip around the reservoir. There is also an archaeological trail which runs from the car park located up at the north east corner of the reservoir.
The visitor centre near the dam has an adventure playground and café.
There is plenty of parking space at the visitor centre close to the Llyn Brenig dam.
Mostly good tracks and footpaths, but some muddy sections, particularly during rainy periods.