At present a fire road runs several miles along the Cerro de las Posas ridge. In the future a 200-acre regional park will be located on the Double Peak ridgeline, with picnic and group camp sites, an equestrian area, museum and amphitheater. An improved paved and soft-surfaced trail will replace the fire road and run the entire length of the ridgeline from Double Peak west to the microwave towers overlooking Lake San Marcos.
Coastal Sage Scrub and Chaparral habitats are the most commonly encountered native plant communities in the area. The Harmony Grove fire swept over these hills in October 1996 and many burned shrub skeletons are still evident. The plants, however, are making a quick comeback. Abundant native shrubs include Laurel Sumac, Lemonade Berry, Chamise, California Lilac, Scrub Oak, Monkeyflowers, White & Black Sage, Mission Manzanita, California Buckwheat, Toyon, Bush Mallow, and Coyote Bush.
To access the trailhead, start at Lakeview Park off Foxhall in Discovery Hills. Cross the spillway bridge and the Discovery Lake Dam, and head up the paved road that winds up the hill through the new development on a soft-surface trail, crossing the street at Via Vera Cruz, passing between the houses and up to a large water tank (about 3/4 mile). A soft surface trail begins at the end of the paved road just to the left of the water tank. Follow the Double Peak Trail Sign. About 1/2 mile watch on the right for another "Double Peak" trail marker, turn right and follow the trail to the ridge. Go left on the ridge and watch for further trail markers.