(3) Base Camp
The Jungle Book looks innocuous enough—sometimes there's a little elephant on the cover, or a still from the Disney movie—but the book was first published in 1894, and books were just harder to read back then. The vocabulary is a little more advanced than your typical children's book, and there are occasionally violent scenes which are difficult to read. Still, it's easier than preparing for an actual trip to the jungle, and each story often has a nice moral lesson, whether you live in a jungle, an urban jungle, or a lipstick jungle, whatever that is.