Located in the Puente Hills, and managed by the Puente Hills Habitat Preservation Authority, Hellman Park offers trails into some of the most beautiful habitat in the area. Hike the trails on either side of the reservoir. Both trails are very aerobic up the mountainside taking you on a loop trail to the ridgeline overlooking Sycamore Canyon, a beautiful view. Along the way you will see a large collection of California brittlebush, a Sunflower family member with large yellow flowers in the spring. On a good day Catalina Island and downtown Los Angeles are observable.
Great workout. I do this pretty often when I want to get a good hike in close by. You park off 7th and Orangegrove in Hacienda Heights. After a quarter mile walk up the gravel road, I branch off to the left up the Coyote trail. There's pretty good elevation gains that can tire you out if you're not ready for it. The trail has a lot of switch backs. Once you get to the top of the first hill, at the electric towers, you can start heading back down toward where you started, OR you can decide to complete the beast and take the half mile level walk to the next set of hills, which are larger, with more elevation gains and switchbacks. I like the second part better because it's far more beautiful. It's a lot more foresty (I know that's not a word, but you get it.) overall the trail is mostly shade covered, with the long middle stretch out in the open. It's a really good workout and comes in around 5-6 miles.
I really enjoyed this hike. Beautiful and just challenging enough for a moderate work out. However, I hiked the coyote hills trail and about a mile and half up the hill, I saw a group of 4 coyotes together. I was alone with my dog, so we turned around. I would only come back with a group.