(Day 2 - Miter Basin, Crabtree pass (class 2, a little sandy and loose on the northern side), down to the JMT, hike on cushy trail until tired)
(Day 3 - JMT to Lake South America, up and down Caltech Peak and nearby peak (should be class 2 with good routefinding))
(Day 1 - Horseshoe Meadows to Langley (class 1 walk up) to lake at base of The Major General (maybe class 2 scramble down))
(Day 4 - Lake South America, Forester Pass, Kearsarge Pass to Onion Valley. Hitch back to Independence / Lone Pine (or back to the car if possible))