If you have never seen a Waldo book before, here's a short overview:
"Where's Waldo" series consists of unique colorful picture books where the illustrations are filled with hundreds of tiny characters doing all kinds of funny things. Your goal as a reader is to find Waldo, a guy in red and white shirt on all those pictures. If finding Waldo gets too easy then you can try to find his companions, his friend Wendy, Wizard Whitebeard, bad guy Odlaw, and dog Woof. And after that you can spend countless hours finding miscellaneous special items unique to each picture.
Mentally, this activity is similar to assembling a 5000 piece jigsaw puzzle, only it's more fun.
Each book follows a theme, this particular one is set in Hollywood, and every picture is a movie set. There's a black and white silent movie, some history movies, a musical, a fantasy, a western, and others.
One great thing about Waldo books is that even small children can spot Waldo as well or even better than adults, it doesn't require any skills other than good eyesight and attention to details. This makes it fun to read together and compete with your kids of virtually all ages, not just 4-8 as the Amazon reading level suggests.
"Where's Waldo: In Hollywood" has some particularly hard extra puzzles, harder than any other Waldo book that I've seen. The ultimate problem is in the inside of the back cover: there's a list of 176 character faces, almost all of which appear somewhere among the thousands of figures throughout the book. But ten of them do not, and you have to find out which ten! I don't know anyone that has successfully found all of them yet. So I challenge you to find them! :)