Stayed 3rd week September and were really lucky with the weather.  That said it was a very pretty and pleasant site.  It wasn't regimented and there was plenty of space.  No complaints about the facilities either. Situation was excellent in terms of access to high mountains, coast, narrow gauge railways, sea side and beaches, castles galore, stunning views, cycle path almost from site and loads of walks of all levels of difficulty.  The cafe at Trawsfynydd lake does a lovely cup of tea and slice of bara brith at a truly low price.  Finally I would say that Zip World at Blaenau Ffestiniog is a must.  The views and exhilaration from the journey on the zip wire are not to be missed.  We will be back.  NB the dog thought the dog walk, although small, was paradise.  Not everywhere has long grass and a stream to paddle in!