I am going to refrain myself from commenting or giving opinions about Yellowstone NP until I do the entire loop and see what it has to offer. One thing I can tell now is that it’s really high altitude and I can feel it. Started my day at 1900 meters went over the pass as 2720 and now I am at the campground at 2400 meters. Feeling kinda ok but there is this bizarre sensation of a headache lurking somewhere around the corner. And I drink 3x more water than normally - I am halfway though the day and already drunk 5l! Still feeling somewhat thirsty! Crazy! 3 nights at this elevation should get my red blood cells going. ;)