This is a fairly challenging hike, depending on your pace and level of fitness, but it offers some incredible views, which the pictures don't really do justice.
The hike starts at Onion Valley campground and includes a good deal of elevation (two passes around 12,000 feet). You start climbing at the outset, and keep climbing for the first couple of hours before hitting Kearsarge Pass. Here you begin a long descent, then traverse above some beautiful lakes on the Sierra High Route before joining the PCT/John Muir Trail, which brings you to the second climb and Glen Pass. After this, it's another long and occasionally steep descent into the Rae Lakes area.
Campfires are not allowed above 10,000 feet, which means they are forbidden at Rae Lakes campground. Bear canister is a necessity.