Head to the Sourthern Rhinogs, just above Talybont and Dyffryn Ardudwy.
Superb walking country, extremely quiet, even on busy Bank Holidays, and walking mostly on grass.
Most people think the entire Rhinog range of mountains are rugged and hostile, no place for the unprepared walker, well the southern section towards Barmouth, are a walkers dream.
A bit like the Brecon Beacons, but with magnificent sea views, and their less than half an hours drive from Porthmadog.