Here's the book: The Call of the Wild + Free: Reclaiming Wonder in Your Child's Education by Ainsley Arment.
https://www.goodreads.com/book/show/42078805-the-call-of-the-wild-and-free
I happened to see this book in the library last week and checked it out on a whim. It's a quick read. I read the book in just a few readings. It's more of an inspirational homeschooling book than it is a practical one. The book is more about how kids need unstructured playtime outside than it is a how-to manual for homeschooling.
The first part of the book - I didn't really like the book at that point. I already understand that playing outside is important for a kid's development. My kids spend time outside every day. We even do school outside if the weather is nice.
A big part of the beginning had an unschooling flair to it. I tend to be instinctively skeptical of the "just put everything aside and let the kids follow their interests" philosophy - even though I actually do that quite a bit - and one of my favorite homeschool bloggers is Sue Elvis, an unschooler from Australia. (She has probably THE absolute best homeschool blog out there, by the way: https://www.storiesofanunschoolingfamily.com ).
Letting the kids decide what to do with their time sounds amazing until I'm faced with the reality that is my own kids. The youngest three do not do well with too much unstructured time. If we take a month off from school, their behavior (especially the 5 year-old's) deteriorates quickly. My 15 year-old, specifically, wants an assortment of learning activities and books set out for her every day. We also don't live near the beach like the pictures in the book and we can't go beach-combing all day. We live in a city - a very ugly city - for that matter. If you took pictures of us in our city, it wouldn't look like the pictures in this Wild + Free book.
When I reached the third section, I started to really love the book. I couldn't put the book down. As someone with a degree in biology, I completely agree that kids can learn a ton by spending time in nature. I also agree with the chapters that covered children needing stories and unstructured pretend play for their development. I liked being reminded that it's important to say "yes" when the five year-old invites me to sit on the floor and play with him. He's inviting me into his world. I can't always be too busy to accept his invitation to play. If I constantly say "no," at some point, he won't invite me anymore.
Overall, I enjoyed the book so much that I bought their handcrafts book: https://www.bewildandfree.org/handcrafts Expensive book...yes...I'm going to try all of these projects with the five year-old, though. It looks like something we will both enjoy doing together.