Pitlochry
If you're wondering what it feels like to visit a salmon ladder in the first days of January, I can tell you from experience it's very, very cold - but worth it just to see the reflection of the trees and hills on the water (though walking on icy slush downhill is quite a tricky endeavor). Pitlochry was so incredibly charming - I'd love to go on holiday when the temperatures are a bit higher!