We spent the entire day at Yellowstone.  It was exhausting but amazing!  Beginning with the Bill Cody Dam and ending with Old Faithful.  In between we saw waterfalls, hot springs wildlife and fantastic scenery.  We left Old Faithful about 9 and couldn't find civilization until about midnight.  A little unnerving but we survived.  Also the weather is crazy yesterday it went from 45 degrees to 91 in a matter of hours and then back down.  And it'll get cold and rain for a few minutes and then clear up.