The second book in the series, Val takes Billie to Great Sand Dunes National Park. Billie and the children she meets play in Medano creek, climb the tallest dune in the park, watch kids climb a vertical dune, and much more. Val and Billie continue their adventure to Zapata Ranch where Billie meets her cousin Lilly. Lilly then takes Billie to the Zapata Falls, sees the Great Sand Dunes from a distance, and introduces Billie to her bison relatives who live on the thousand acre ranch. Amazing photographs by photographer Mark Niederquell combine with action and adventure to bring The Great Sand Dunes/Zapata Falls to life.