Zennoji Temple is pleasing on the eyes, but where the experience is elevated to a new level is through the zazen meditation practice within its calming tatami interior. Led by the temple's head monk, you will assume a typical cross-legged position (kekkafuza, or "full lotus"), while connecting your hands to form an O'shape—the "cosmic mudra" which encourages the flow of universal energy—before embarking on breathing exercises and (hopefully) the expulsion of thought altogether. 
You can calm your mind in a quiet atmosphere in the Hiyashiyama Temple Are.