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A quick and easy secret about photography is polarizing filters.
Use one, and you'll get more vivid colours. Additionally, you will get rid of nasty reflections on metal, glass and water surfaces.
To see what I mean, look at two images below.

Green leaves and blue sky, no polarizing filter, Puvociai, Lithuania

This photograph is what you'll get if you don't use a polarizing filter, as most of us do.

Green leaves and blue sky, with polarizing filter, Puvociai, Lithuania
 

This picture was made with circular polarizing filter on my Nikon 80-200 lens, same object, a second later. Notice the following changes:
- The color of green leaves is fresher, without nasty reflections from the sun.
- The sky is darker, it's blue colour is more intense, which brings more contrast to the picture.
- White color of the clouds is more.. white. The edges are clearer.

I know what you're thinking. So let me tell you that even though we live in digital age, it's very difficult, if not impossible, to replicate the effect in Photoshop.