Sunrise and sunsets are the best times for taking pictures in terms of lighting. If you add water (lake, pond or a sea shore) you can increase the effect by having blue in the sky and blue below the horizon as well.
Plant gives some examples as well as a number of tips as to when to start (and stop) shooting, what equipment to use (for example a grad ND filter) and how to compose the image to draw in the viewer.
You can check out many more helpful photography tips on our Photography tips section here on LensVid. We have covered many more great tips for landscape photography on our landscape photography section here on LensVid.