in no particular order of preference 

Before They’re Gone: A Family’s Year-Long Quest to Explore America’s Most Endangered National Parks, by Michael Lanza

Last Child in the Woods: Saving Our Children From Nature-Deficit Disorder, by Richard Louv

Babes in the Woods: Hiking, Camping & Boating with Babies and Young Children, by Jennifer Aist

The Down and Dirty Guide to Camping with Kids: How to Plan Memorable Family Adventures and Connect Kids to Nature, by Helen Olsson

How to Raise a Wild Child: The Art and Science of Falling in Love with Nature, by Scott D. Sampson

Take a Hike with Your Children – From Tots to Tweens in the Canadian Rockies, by Lynda Pianosi

Outdoor Parents, Outdoor Kids: A Guide to Getting Your Kids Active in the Great Outdoors, by Eugene Buchanan

Up: A Mother and Daughter’s Peakbagging Adventure, by Patricia Ellis Herr

The Kids’ Outdoor Adventure Book: 448 Great Things To Do in Nature Before You Grow Up, by Stacy Tornio and Ken Keffer

Small Feet Big Land: Adventure, Home, And Family On The Edge Of Alaska, by Erin McKittrick

I Love Dirt!: 52 Activities to Help You and Your Kids Discover the Wonders of Nature, by Jennifer Ward

Home Grown: Adventures in Parenting off the Beaten Path, Unschooling, and Reconnecting with the Natural World, by Ben Hewitt

Don’t miss all these Resources for Outdoorsy Parents!