Hollins, Dave R, Hugo and others have mentioned Plas Rhianfa (now Chateau Rhianfa) several times on this Forum.
It is just outside Menai Bridge, on the Menai Straits. facing Bangor Pier.
So, Mrs Fester and I made our way there yesterday for a great overnight stay.
The building and grounds are superb, the level of craftsmanship involved in everything is exceptional, and the food is the definitive example of fine dining.
I have stayed in many 5 Star hotels around the world (usually on business) in the past, but I have to say that Plas Rhianfa ranks as the best hotel I have ever stayed in, for many reasons.
Sitting in the hot tub yesterday, I threw open the large doors to have a view across the Menai Straits to Bangor, The Pier, and the snow-covered mountains beyond.
Sadly, when I took the photo today, you couldn't see the mountains due to the low cloud. But mercifully, nor do you have to suffer the sight of me in the hot tub.
It really is blissful, and I can't WAIT to go again.