In case you haven't heard, there are a few more things to do around Mt. Lowe. Volunteers have restored historic pathways to sites and ruins of the horse stables, tennis court, and fox farm. They also installed new signage.
A short ways down the road from the campground, the Horse Trail connects the stables with Lookout Arbor.
Next to Lookout Arbor, the Tennis Court Trail climbs briefly up the slope to a flat area where the tennis court used to be.
And at Five Points there's a sixth point now, the Fox Farm Trail.
You can see interesting ruins at both the stables and the fox farm, but the tennis court is just a big, flat space now.