Grab your hiking gear and get ready for a math adventure! Learners explore the meaning of percent grade change, as compared to the slope in an excellent learning exercise activity about hiking trails in the mountains of New Hampshire. They use real data to compute the percent grade change for roadways and trails, then use their results to draw conclusions about steepness of inclines. A review of the Pythagorean theorem is incorporated into the lesson. The publisher has identified this as compatible with CCSS.Math.Content.7.EE.3, but it may be challenging for seventh graders.