The easiest way that I find to quiet the mind is to want to have a quiet mind, to value the ease and openness of it, and to choose to make only as few thoughts and feelings as necessary. Making thoughts and feelings, running around doing things, etc. requires energy and struggle. To feel less tired and stressed, minimize the things you have to consider or make/do; consider and do things more reluctantly. Having a quiet mind also allows one to see more details in the world, in a less filtered way.