I love using the Glow tool on my landscape photos, especially with images that have either a good amount of sun glow in them or with photos that have a natural water source. Even only a small amount makes a big difference to the photo by adding a lot of brightness and those areas tend to stand out a lot when it is applied.
Pro tip: When using this tool, make sure you press the J key to ensure that you don’t over-expose the highlights too much; you’ll see red appear in areas that are clipping the whites, and blue in areas that are clipping the blacks. This tool will really exaggerate the whites in the photo, so it’s easy to do. And, if you see a lot of red overlays appear in your image when previewing the highlights, go into the Light tool and reduce the Highlights slider until they are gone.