an activity book can help lead people through one or more predefined activities , or provide instructions for interacting with people and enjoying activities together . an activity book can combine humor , light - hearted fun activities , intrigue and mystery , mind challenges and / or introspective conversation . the activity book may be , for example , a lighthearted activity or entertainment book designed to aid people that are attending certain events , places or special occasions . in some cases , the activity books may include hidden surprises .