Following Meriwether Lewis and William Clark's Corps of Discovery as they navigate the muddy Missouri River and begin a great adventure, this activity book is set against the background of the vast North American continent. It takes children from President Jefferson's vision of an exploratory mission across a continent full of unique plants and animals through their dangerous and challenging journey into the unknown to the expedition's triumphant return to the frontier town of St. Louis. Twenty-one activities bring to life the Native American tribes they encountered, the plants and animals they discovered, and the camping and navigating techniques they used. A glossary of terms and listings of Lewis and Clark sites, museums, and related websites round out this comprehensive activity book.