Try posting this on the San Gorgonio Wilderness Association website. You'll probably get more local advice:
http://www.sgwa.org/Try:
South Fork with overnight at Dry Lake;
South Fork to High Meadow Springs (camp there);
Fish Creek (as mentioned above);
Vivian Creek with stop at High Creek.
Alternate would be San Bernardino Peak with an overnight at Limber Pine Bench. Not the highest peak in the range, but great views over the San Bernardino Valley most of the way up after getting above the treeline.