The Upper Boy Scout Lake fishing area in California is popular for its trout fishing. The lake is home to rainbow, brook, and golden trout, making it an ideal spot for anglers. Nearby activities include hiking, camping, and rock climbing. Fishing tips include using small lures and flies in the early morning and evening. The best time to visit is from late spring to early fall, with average temperatures ranging from 50 to 80 degrees Fahrenheit. It's worth noting that the area is only accessible via a strenuous hike, so visitors should be prepared for the rugged terrain.