This is a beautiful campground up in the hills above Altadena with a great view of the valley below. Lots of greenery and flowing water in the winter season with wildlife all along the trail and campground. Tables and fire stoves (check for permits) at most of the 12 tent sites but no running water, trash or privy so bring WAG bags and pack out. One of the old campgrounds, like First Water and has a neat history in the hiking books. The best way to get here is from Eaton Canyon, park legally on the streets, take the truck road up to and through Henninger Flats for about a mile past the flats. Look for a small footbridge at that point and follow the trail to Idlehour. Not a fun hike on scorching hot days due to the lack of shade, but on cooler foggy days it's a great trip. About 8 miles round trip. Very secluded and there's trails down to the stream in Eaton Cyn above the waterfall. DON'T CLIMB DOWN THE FALLS OR YOU'LL BE ON THE EVENING NEWS!