We went via South Ridge Trail. The dirt road was in great condition and the Ranger even felt a low-clearance vehicle would be fine. My wife, daughter, dog and I set out and quickly realized that living at sea level does not bode well for our mountain legs. The trail has some pretty solid elevation gain (2,400') over it's 4 mile (one-way) trek. Where it leveled out, we stopped for a snack and to let my 14 month old daughter roam. She was in love with the mountains and had the biggest smile on the whole time as she played with pine needles and sticks. I'm pretty convinced I've got a young hiker on my hands.
We went onward as we could see the peak within striking distance, however, this last part was the toughest. The switchbacks go on and on and the trees become more sparse, as does the shade. The sun was beating down and every illusion of a nearing peak was an optical illusion. With a 22lb child on my back and more, it was safe to say I was getting tested. But after 3.5 hours we made it. The views to the West toward Lake Hemet, to Suicide Rock and Deer Springs Trail to the North, the vast wilderness area and the PCT to the South and some awesome rock walls and the San Jacinto Wilderness Area to the East were very awe-inspiring. The lookout tower, deck provided a better view as there were several trees protruding the view from the boulders on the peak in certain directions. We had lunch and enjoyed the shade and a rest. It was awesome to have conquered a mountain with my whole family and my daughters first summit!
We made it back to the car in 1.5 hours and had the rest of the day to rest and play. Great hike to get the blood flowing and perhaps train you for bigger peaks.

Have fun.