This photo popped up on my desktop reminding me of a wonderful night I had my family in Paris a few years ago. Staring at the photo I realized that fun is a state of mind I can access anytime I want. My morning smoothie and cashew crunch were particularly yummy today:)
Time invested: nothing to decide to see everything as a fun.
Cost: free
Time I feel joyful: when I enjoy all of life's experiences.