Located at the base of the San Gabriel Mountains and Angeles National Forest, the Claremont Hills Wilderness Park offers nature lovers a five-mile walking loop, along with smaller trails. The loop is one of the most popular in the Inland Empire, offering moderate elevation and dramatic views stretching to Downtown L.A., Catalina Island, and the Inland Empire basin. The 2.8-mile Thompson Creek Trail that abuts the park's southern point is also popular with walkers, runners, bicyclists and leashed dogs.