Remains of a fire lookout and cabin still occupy the summit of Mt. Islip (elevation 8,250) which is a popular destination for its views as well as its proximity to the Pacific Crest Trail, Crystal Lake (including the car camping campgrounds and cafe), and Little Jimmy Campground (possibly the best backpacking campground location in Angeles National Forest). Enjoying a nice sunset on the often cool and windy peak and then travelling down to spend the night in a tent at the much warmer protected area of Little Jimmy Campground (also near water at Little Jimmy Springs) is a great way to begin a backpacking trip–something lots of Boy Scouts do on Saturday nights.