Good day,
This is a fabulous hike with some really terrific views. I would suggest lunch, here:
http://binged.it/T7aLMt.
It will be mostly uphill going and you will go over Cathedral Pass, but it is definitely doable in a day. There isn't much at Sunrise Camp if you don't have a reservation there, so no big deal if you turn around early.
If you want a neat side trip, consider the Lower Cathedral Lake.
Good hiking, Ray
Ray Rippel
Author,
Planning Your Thru-Hike of the John Muir Trailhttp://jmtbook.com/Follow me at:
www.twitter.com/JMTBook