I just finished a cute, little book by Bill Adler, Jr. 365 Things to Do with Your Kids: Before They're Too Old to Enjoy Them. Basically he comes up with an idea and expands and describes it. I already do many of his ideas and plan to try others. Some of my favorites I've listed below:
# 34 Play Imaginary Stock Market
# 66 Create a continuing story with your kids.
# 137 Sit around thinking up "what ifs"
# 214 Every year on their birthdays write your children a letter telling them how much you love them
# 219 Celebrate a half birthday
# 226 Make wave bottles using colored water and oil and other liquids.
# 227 Make hand prints in plaster on paper plates; then paint and hang from ribbons
# 234 Have a family scavenger hunt
# 297 Play a memory game
# 352 Talk about what you would do if you had one hundred million dollars
# 353 Talk about all the great things you would still have if you didn't have any money at all.
# 355 Write a contract with your child over something important
# 365 Think up your own ideas for things you'd like to do together before your children are too old to enjoy them.