This is a good indoor activity, especially good if the weather is not suitable for playing outside. Puzzles are widely available and typically very inexpensive. Make sure the puzzle is age appropriate, not too difficult so that your child doesn’t lose interest quickly.  If you want the activity to be more educational, choose a puzzle with a theme: the world, United States, the solar system.  I think it is best not to help out too much, but rather let your son or daughter work the puzzle with only a little assistance from you. You can scratch your head as you pretend to look for a piece, and maybe occasionally nudge it into view if you see your child is having trouble. One of my favorite puzzles for kids who are about 4-5 years old and up is a puzzle of the United States of America with pieces in the shape of the states. What a great way to learn about the 50 states while doing something fun at the same time!