After spending a full day at Picacho State Park, we went to Saguaro National Park. Neither one of us (me or my husband) had been there before.  We have a goal of making it to every U.S. National Park, so of course we had to visit that one.  I think I have mentioned in a previous post that I have about half to see still.             Saguaro National Park is one of a kind.  It has an insane number of diverse plant types.  The one that seems to attract visitors the most is the Saguaro cactus.  They are the largest…