Start at the Dog Lake/JMT TH parking lot and heads north toward Dog Lake. Passing the cut off to Dog Lake (stay left), you head up the remainder of the trail to the lowest of the Young Lakes with majestic views of both Ragged Peak and Mt. Conness looming over. I recommend setting up camp at the middle Young Lake if there is chance of wind and hiking up the Upper Lake to look around. If the weather is perfect, then the Upper Young Lake is magical. I'd not camp at the Lower Young Lake as there will be more people. On the return trip, you can take either the same route back past Dog Lake (to the left at the intersection), or you can head back to Tuolumne via the Glen Aulin Trail. I recommend taking the Glen Aulin back for different sights.