I would highly recommend this route to Little Yosemite Valley from Tuolumne and JMT. The climb is very gradual up to Tuolumne Pass and the High Camp.
The hike up from the Camp to Vogelsang Pass is a series of long easy switch backs passed the Lake all the way up to the pass, all above tree line. Great views from the pass down into the valley below and you will be going down hill all the way to Yosemite valley with some great options for camping along the way.
1 Gallison Lake (seen from the pass) no trail to it. 2 Bernice Lake. Beautiful. The trail sign says 1 mile, but I am certain it is less than a mile to the Lake. Mostly uphill, but not bad. Well worth the effort. The highest peak across the Valley is the back side of Lyell Peak. 3 Before you reach the trail to Bernice Lake, you will pass through a meadow/valley with water running through it and excellent places to camp. 4 Merced High Camp. Great water, lake and falls, swimming holes. Tenting area for backpackers. 5 Bernice Lake all the way to the valley would be a reasonable all day hike, but if you stay at the tenting area about 4 miles out from the valley,just before the jct. with the JMT, you will be at a great take-off area for including a hike of Half Dome, if you have time. You will not have to climb the long four miles up out of the valley as you would have to do, if you headed out to climb half Dome from there.
Be sure to take the Mist Trail down, too. It is very steep until below Nevada Falls, but you are going down. Nevada Falls and Vernal Falls are well worth it. The JMT might be an easier grade, but it is dusty and a long slog. Both are popular trails up from the valley, so expect company those last 4 miles or so. September should be less crowded.
PS I hiked it just a few weeks ago ( c. August 10) and camped alone at Bernice Lake! Keep an eye out for osprey. Again, one you reach V. Pass it is all downhill to the L. Y. Valley.
rambler