I call my early morning walks my 'meditation periods'.  I am in another world --- alone with myself.  I may work through in my mind a problem I'm having with a computer program --- or simply replay an old memory.  I may recall an old friend and an event that I haven't thought about in years --- sometimes, even from another era....  I do not always solve the problems, but a lot of times I do!  And as for the old friend?  I compose a letter to him in my mind that I write later and relive the event with him.  My meditation period sets the tone of the day for me.