how to preview sun direction without rendering (cycles)

I am trying to preview the direction the sun is shining. It is confusing to figure it out using the angles provided in the transform dialogs.

Is there a way to draw a line in the view port that indicates the sun’s rays?

I have tried the native sun and the (awesome) sun plugin, but cannot find what I am looking for.

My apologies if it is an obvious thing.

The sun lamp has a big line coming out of it in the direction of the rays. If you can’t see if your scene scale may be wayyyy off. Either scale down your scene to real world levels, or scale up the lamp until you can see the ray line.