I have thought for some time now that the Mokelumne above Salt looked good on a map. I'll have to try that sometime. A really nice adventure would be to continue up to the area of 4th of July Lake.
Also, another nice area for practicing one's skills, both on and off trail, and which has no quota system ( permits are required, but it is not a problem to get them and they're free) is the Emigrant Wilderness, along Highway 108. But work on those map skills before you do anything off-trail. People get lost every year, not knowing what they're doing.