The only place along the route that I am aware of bear activity is along the Middle Fork Kings River in LeConte Canyon, especially Big & Little Pete Meadows. One year there was a funny sign near the ranger station warning of recent bear activity. I have always avoided the area but there are several large group sites along the river.
Regarding bear canisters, according to the sierrawild.gov food storage map the only place that bear canisters are required on the loop is from the JMT/Bishop Pass trail junction, through Dusy Basin and all the way over Bishop Pass to the trailhead. If you're interested here's a link to the map: http://sierrawild.gov/media/site/foodst ... 082609.pdf
All along the creek in Evolution Meadow there are plenty of group sites. The sites at the bottom of the falls are dark with tree coverage. Even if it's late in the day it's worth taking the switchbacks up into Evolution Meadow. There are several large spots to the south of the creek near the top of the waterfall.
There are some amazing camping spots just to the south/southwest of Evolution Lake between the lake and the outlet creek. The views of Mts. Darwin & Mendle are great. There is also a small covered spot at the top of the waterfall (only large enough for 2 or 3) w/ good views of Evolution Meadow.
The spots to the west of the trail above Sapphire Lake have very good sunset views of Mt. Huxley but it's usually a windy area. There are also some illegal spots in the rocks within the outlet creek. I have only used them as a good place to eat dinner and enjoy the views.
If you don't mind exposed spots way above treeline there is good camping along the northern shore of Wanda Lake. My wife and I camped just above the north shoreline last summer. Stark and beautiful.
In Dusy Basin there are good spots along the western shore of Lake 11,388 (and the un-named lake just above it) large enough for a small group. Very good views of Mts. Winchell, Thunderbolt, Isoceles and Columbine at sunset. The lakes that lead to Knapsack Pass in lower Dusy Basin will probably be a mosquito nightmare this time of year.