You can park all night on the main carpark at Barmuth from 6pm to 8am and it is £3.50 during the day. There were several motorhomes there overnight on Saturday. There is a country music festival this weekend. There are several secluded laybyes along the estuary where motorhames are usually parked up. It is a beautiful part of the world not far from Dolgellau and Cadair Idris. Also the beautiful Mora Dyffryn beach and nature reserve isn't far away. It was feature on Springwatch a while ago. Also along the Cabrian coast you can get an all day rail rover ticket for just £6.00 and explore thiis stunningly beautiful part of Wales. Regards LC