Here's a list I found at the end of my diary, circa July 2001.
Once a day, a game - tennis, chess, pick up stix, anything
Dance when you're alone
Reread a favourite childhood book
Throw a spur of the moment party
Marbles - floor games, hopscotch
Follow an international news story. Memorise names of key figures. Research background issues.
Read 3 different books about a single famous person. Do the authors agree on facts or motivations? What do YOU think?
Outline of intended activities for next year
Five year plan
paragraph describing yourself in 20 years.
buy a 5 year date book and use it!
STretch your mind:
Step out of patterns.
Take a different route to work. What do you notice?
Eat a meal in a different place. Is it less/more satisfying?
Sit in a public place - make predictions about what people around you will do. When you get 3/5 right, quit.
What a funny list. I'm not sure where I got it from.