Jack, Ashley, and their parents visit Hawaii where they meet a Vietnamese boy who is going to live with his American grandfather whom he has never met, and are pursued by the Goddess Pele.

The Landon family travels to Glacier National Park to investigate why grizzly bear cubs are disappearing and become involved with a ten-year-old Mexican runaway boy.

Twelve-year-old Jack, his younger sister, and the family's teenage foster child Troy go to Yellowstone National Park, where Jack's mother, a wildlife veterinarian, is investigating the report that wolves reintroduced to the park have killed a dog there.

Originally published: Washington, D.C.: National Geographic, 2002.

In this early chapter book set in Waterton Lakes National Park, Cricket and her friends help a band of long-toed salamanders safely migrate across the road to Crandell Mountain.

While visiting the Everglades National Park with their parents, the Landon children uncover the mystery of dying manatees and learn important lessons about the natural environment.

For use in schools and libraries only. The Landon family makes a trip to Death Valley National Park, accompanied by a mysterious new foster child, 14 year-old Leesa Sherman.