Could always try out the infamous Shell Island.
Some people hate it because of the party atmosphere at weekends in the dunes but I like so many others love it to bits.
If you want more peace and quiet then camp towards the harbour, if you like camping in the dunes in secluded areas with a campfire (in approved fire pits only) and dont mind music and noise in the distance (few red wines on an evening act like ear defenders!) then camp in dunes. Dogs are allowed and it has its own beach accessed from a stoned car park or on foot from the tent over the dunes.
Probably within your distance requirements (just outside Harlech, mid wales.)
Also plenty more campsites similar between Harlech and Barmouth that are directly adjacent the beach (or less than 5min drive)
Paul
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