I hope you mean its a day hike because it starts and finishes at the Shepherd Pass Trail Head, not the pass itself. Otherwise, I'd feel free to nominate the Denali West Buttress Summit from Camp 4!
Yup, trailhead. I'd throw in Observation and Shakspere (yeah, it is spelled that way), but I didn't think much of the Deer Meadow area of the JMT. The rest of the hike is actually incredibly scenic, bounded by the Palisades, the Black Divide, and looking into the Dumbbell Lake basin.
I also think the first 3 miles of the McGee Creek trail, either in full flower or full fall color, is one of the best local hikes around.