On a beautiful summer afternoon in 1998, Dan Stephens, a 22-year-old canoeist, was leading a trip deep into Ontario's Quetico Provincial Park. He stepped into a gap among cedar trees to look for the next portage - and did not return. More than four hours later, Dan awakened from a fall with a lump on his head and stumbled deeper into the woods, confused. Three years later, Jason Rasmussen, a third-year medical student who loved the forest's solitude, walked alone into the Boundary Waters Canoe Area Wilderness on a crisp fall day.

In 1963 Colin Fletcher became the first man to walk the length of Grand canyon, below the Rim. It began with a dream, when he and a friend detoured from a cross-country trip to take a hurried look at the great natural wonder. Standing on the Rim, surrounded by the profound and almost mystical silence, Fletcher knew that something had happened to the way he looked at things. He also knew that the Canyon, with its depths and distances, cliffs, buttes, and hanging terraces, beckoned to him, calling him on a journey that would challenge both his body and his mind.

Amusing and informative, Hey Ranger! teaches as it entertains with tales of boat-ramp misadventures, lost Afghani campers, encounters with wild animals, dumb crooks, and more. One chapter, "Tales from the Wild Side", brings together unusual incidents from National Park Service reports, and the concluding essay, "Don't Be a Victim of Your Vacation", advises visitors on how to avoid being a story on the evening news.

After graduating from college, Jennifer isn't sure what she wants to do with her life. She is drawn to the Appalachian Trail, a 2,175-mile footpath that stretches from Georgia to Maine. Though her friends and family think she's crazy, she sets out alone to hike the trail, hoping it will give her time to think about what she wants to do next. The next four months are the most physically and emotionally challenging of her life.

David Roberts describes the culture of the Anasazi - the name means "enemy ancestors" in Navajo - who once inhabited the Colorado Plateau and whose modern descendants are the Hopi Indians of Arizona. Archaeologists, Roberts writes, have been puzzling over the Anasazi for more than a century, trying to determine the environmental and cultural stresses that caused their society to collapse 700 years ago. He guides us through controversies in the historical record, among them the haunting question of whether the Anasazi committed acts of cannibalism.