If isolation is your goal, then this might be your trail. Near the end of Upper Setting is this unsuspecting, unmaintained spur leading you to Castle Lake. Although it may not require a well-built vehicle or even 4WD, the occasional rocks and mud puddles keep the low clearance crowd away. Once you reach the end, you are treated to a single, solo campsite right near the edge of the lake. A short walk takes you down to the water, where you can enjoy pure solitude.