I will be visiting a friend in Yellowstone for a few days in late August. This will be my first time there as an adult (I was there when I was 5 on a family trip). Anyone have favorite day hikes or not-to-be-missed sights there to recommend? Logistics of planning an overnight backpack will just be too complicated, unfortunately.
Another friend highly recommended doing at least a day in the Grand Teton park; how far away (in hours) is that and what would be a good day hike there if I only could pick one day's worth?

