Grand Canyon.  It became sunny in the late morning.  It had thunderstorm in the afternoon.  I was very lucky guy.  To avoid lightening, free shuttle buses in the park were canceled while I was in an area where only shuttle buses, bikers and pedestrians can go.  There were buses which can take us to outside of the area but no buses which can bring new people into the area.  Many people, who can come to Grand Canyon once in their life time and are not afraid of lightening and severe rain, and I enjoyed not really crowded Grand Canyon for a while.