As you can see in the map below (provide courtesy of the Conejo Open Space Foundation), you can actually hike a nice loop on the Lynnmere Trail and connect to other trails in the area.
There are a number of places where you can enter the Lynnmere Trail, including:
Several trails from Wildwood Park connect to Lynnmere Trail, including Wildwood Canyon Trail and Tepee Trail
The hike outlined in the image above is the fairly strenuous, seven mile Arroyo Conejo/Lynnmere Loop hike described at www.cosf.org/website/html/arroyo-conejo-lynnmere.html. Park at the Rancho Conejo Playfield at 950 N. Ventu Park Road and the Arroyo Conejo trailhead is on the right.
After about a mile and a half of rolling hills, there's a descent into the canyon. You'll come across the creek at the bottom, where you'll find a foot path. Soon after crossing the path, you'll find a sharp right (unmarked to my knowledge) turn up the barranca to the Lynnmere Trail, and you're on your way.