If you are making a trip to Disneyland, get this book. Its a fun way to explore the Disneyland resort. You have a great scavenger hunt and can even score points. What I think is best is to have a multi day hopper to enjoy the parks and spend the final day doing the scavenger hunt.
My first and favorite hidden mickey is in the haunted mansion. If you don't know where it is, you will just have to keep your eyes open!