The Golden Hour is an informal term used mainly by photographers. It doesn't really have an official definition the same as dawn, dusk, and twilight, it just refers to a state of natural light that mainly takes place around sunrise and sunset.
Separating Cornwall from Devon (or some say England) the River Tamar rises within three miles of the north Cornish coast above Bude and flows south to enter the English Channel in Plymouth Sound.
The dictionary states that a cove is 'a part of the coast where the land curves inwards so that the sea is partly enclosed' In Cornwall we have many, here's just a few you might like to explore.