This is in the San Rafael Hills, the trail (mainly fire road), leads up and around the backside of Descanso Gardens. It is an advanced beginner/intermediate hike. The pace on this out and back trail will be not too fast, and not too slow--it'll be just right. The terrain is up and down almost the entire way, with a few flatter spots on the trail to catch your breath.
Access is from a trail that starts 50 yards west of Descanso Gardens. It has a steep start (and a few other steep places), but turns into some rolling hills with great views. We return the same way. Faster paced hike, but not so hard.
The link below shows some parts of the trail and the yellow gate where we will turn around and make our ascent back.