You should read this for yourself, and read it to your son...
It was written for him, but, since Cub Scouting is family, it is written to you as well.

• We are glad YOU are going to be a Cub Scout. Boy, are you going to have fun!
  
  
• You like to play games, don't you? Well, you came to the right place. Cub Scouts play lots of games.
  
  
• Making things is OK with you too. With the Cub Scouts you can make boats, airplanes, Indian suits, and other things you like.
  
  
• Do you like to pretend you are someone else sometimes? Well, Cub Scouts in their meetings pretend they are cowboys, Indians, space cadets, firemen, policemen, knights, and almost any kind of hero.
  
  
• Do you know what a cookout is? It is a meal cooked outside - in the backyard or a park - by Cub Scouts and their fathers (or mothers).
  
  
• Sometimes Cub Scout families go on a picnic.
  
  
• In fact, whatever you like to do best, you'll probably find it in Cub Scouts.