Where the Forest Meets the Sea by Jeannie Baker

I love this story because it is centered around a summer day with a dad and his son.  A theme not used that much in books.  They go on an outdoors natural adventure while the dad explains what the area might have looked like in years past.  You and your child can spend time looking closely to find the hidden images of dinosaurs and aboriginal people in the collages.  Based in Australia, this book has a strong environmental message.