Today on the First 40 Miles, The Geocaching Episode.  We’ll show you how to turn a simple hike into a bushwhacking treasure hunt and we’ll walk you through the steps to incorporate this fun activity into your next outdoor adventure.  Then, a feature-rich solar charger that can power your next backpacking trip.  On today’s Backpack Hack of the Week, a free app that will get you started Geocaching in minutes.