There is a big lake surrounded by some rocky mountains and there is forest around it, but on one side of the lake imagine a green meadow. The water is very still with no ripples at all, like a big sheet of mirror and the forest is reflected in the water very clearly. Above the mountains the sky is a beautiful blue with fluffy white clouds and the tops of the mountains are covered with snow.

Try to see this image very clearly in your mind. The more vividly you can imagine, the more peaceful you become. An image can create an emotion and since it does not cost anything to imagine peaceful scenery, why don?