A good treasure hunt novel for young ones is 'The Fantastic Mr. Fox' by Roald Dahl. Mr. Fox has to outwit the farmers and find food, which can be thought of as a treasure. 'The Wind in the Willows' by Kenneth Grahame also has parts that are like a treasure hunt. Mole and Rat go on little adventures and find interesting things. And 'Alice's Adventures in Wonderland' by Lewis Carroll has elements of a search for something different, which can be considered a form of treasure hunt for young minds.