Peace And Quiet:

 The renowned Samual Clemments (Mark Twain) had a habit of going fishing with his pole but no hook on the end of his line. That was the only way he could get any uninterrupted time to himself. It is a long-standing tradition that when you are fishing that it is impolite to disturb the fisherman. Sitting along a riverbank with a fishing pole is not only calming but restful.  The famous Mark Twain did not put a hook on his fishing line to not catch any fish and not to be disturbed. 

Sometimes just being out in the fresh air and sitting along a riverbank or a lake or stream without the matter of catching fish is just pure relaxing.