Pre-K is an excellent time to introduce to a child learning through many senses
 (Known as multi-sensory approach).  For example, say that your child likes bugs.  You can read books about bugs,  go outside and count the different kinds of bugs they see by hiking and then create an activity (such as making a caterpillar) from easy to find arts and craft items. The key to keeping a child's interest at this age is to make it so that they "direct" which topics they want to explore. Try and have a list that can be displayed and cross off each topic when he/she feels they are ready to move on to the next.  
 
This is also a great time in a child's life to introduce music, dance and the visual arts.  Field trips to museums, family made scavenger hunts with adult supervision, visiting local parks and family centered concerts are all ways for a child to learn and have fun!  Also, this kind of learning tends to be  very enjoyable for adults, as well!  
 
Pre-K is a very special time.  Enjoy!
 
Louise Sattler, NCSP
Owner of Signing Families
http://www.SigningFamilies.com