Early morning and evening most often provide the best light for outdoor shooting. Backlighting can also be an effective way to emphasize your subject. Midday is not conducive to creating stunning images. The light cast by the sun at this time of day is flat and casts no shadows because it is directly overhead. Most professional outdoor photographers will not even bother to take their cameras out of their bags at midday.
Intensity is the brightness of the light source.
In outdoor photography, more often than not, the light source is the sun. But the type of light coming from the sun can be quite variable. On a clear day, sunlight will be intense creating a bright subject that casts sharp shadows. This hard light brings drama and excitement to your images as well as texture. Be aware though that often your film lacks the latitude to expose both the lit and shadowed areas of your subject.