This trail is mostly straight, flat, wide, and covered in wood chips. It runs between backyards on the border of Palos Verdes Estates and Torrance, hence the name "Boundary Trail." The wood chips can make things annoyingly slow, but on the plus side, it's shady and offers some nice views over the grid. There are a couple of interesting spots. The trail narrows briefly after a couple miles and you get a few nice turns in. Most notably, at the beginning, the hill is great to climb up and then bomb down.
It is highly recommended that you just hit the first section, the hill up to where the trail intersects Via Alameda, and turn around for a fun descent. Then ride over to Valmonte Trail
and Malaga Dunes
to get more riding in. This will be way more fun than doing all of the Boundary Trail.