You're really going to have to work for this one.
Twin Peaks is located in the San Gabriel Mountains of Southern California, just south of Mount Waterman. The Hike to Twin Peaks is strenuous. There is 3,300 feet of vertical gain on this hike. The gain is divided into three long climbs. The longest of which is a steep 1,200+ foot climb on a relatively straight loose trail to the top of Twin Peaks' east peak.
The trailhead begins on Highway 2 about 1 mile east of the Mount Waterman Ski Area. At the trailhead is an intersection of the Mount Waterman Trail which crosses the dirt road at the locked gate. Go left on the Mount Waterman Trail. The Mount Waterman Trail is a fairly gentle 900 foot elevation gain. Take the Mount Waterman Trail all the way to the intersection with the Twin Peaks Trail which is located at about the 7,700 foot elevation.
Take the Twin Peaks trail all the way down to the bottom of the canyon that separates Mount Waterman from Twin Peaks. At the bottom of the canyon is a sign that marks the end of the forest service maintained trail. To this point the trails have been nicely maintained with switchbacks to take the edge off of the steep terrain. The trail to the top of Twin Peaks is nothing like that.
The trail to the top of the east peak starts out deceptively gentle up a low bluff. After a brief descent down the other side of the bluff, the trail begins a brutal climb straight up the side of the mountain. The terrain is very steep, climbing over 1,200 feet in 1.4 miles. In addition, the trail is very loose dirt adding to the work you'll have to put in to get to the top. Once at the top find yourself a good shady spot to park yourself to recharge, because you'll need your strength for the return trip.
While on Twin Peaks you may want to explore. There are lots of great views to be had from the top of east peak. You can also make it from east peak to the saddle with a little cross country hiking. It's mostly downhill from east peak. You can also head up to west peak from the saddle, but be aware that west peak burned in the 2009 forest fire that burned up so much of the western Angeles National Forest. Consequently, you may be disappointed in that leg of the hike. Fortunately, west peak is the only part of the hike that was touched by the fire.
The return trip down the Twin Peaks Trail to the canyon floor is not easy. It is just as slippery heading down as it was heading up. The trip back up the other side is tough too. This trip back up is on the forest service maintained portion of the trail with lots of switchbacks to make the trail easier. However, you already have over 2,000 feet of climbing under your feet and the trip up and down Twin Peaks likely took a lot out of you. Pace yourself back up to the Mount Waterman Trail because the climb is over 1,100 vertical feet and is particularly strenuous after all of the climbing you've already done.
Once you reach the Mount Waterman Trail it is all downhill to the trailhead on a very gentle slope. Enjoy the restful descent.
Check out the Official Route.
This is a moderately difficult hike.
Gate Policy: If a gate is closed upon arrival, leave it closed after you go through. If it is open, leave it open. Leaving a closed gate open may put cattle in danger. Closing an open gate may cut them off from water. Please be respectful, leave gates as found.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.