I'm sure at least some of my readers were raised, as I was, to enjoy the "Swallows and Amazons" series of books by Arthur Ransome. They're timeless classics, still popular today with many families.
The BBC has just produced this 40-minute documentary examining the Lake District, the Norfolk Broads and the Suffolk coastline in which most of the books are set. For those who've never been there, it's a wonderful introduction and background to the world of Arthur Ransome's protagonists. Even if you've never heard of or read the books, it's captivating.
Watch the documentary in full-screen mode for best results.