Been in from bottom and top several times throughout the years. Love this place, especially when it's early in the season and there are zero cars at either trailhead (happens often). A great place for a leisurely stroll.
Got dropped off at the Lower Box and hiked up to Blue Spruce Campground to meet my waiting family. Had the canyon to myself. Patches of clouds and a nice breeze kept me cool. Pine Creek is cold and clear. Watch out for snakes! The views looking upstream seem to be the best.