You don't need necessarily need to spend much. Of course quality music lessons or gymnastics will consistently cost a bunch but the lion's share of things will

You don't need necessarily need to spend much. Of course quality music lessons or gymnastics will consistently cost a bunch but the lion's share of things will not. I know plenty of impressive scientists who were very middle class growing up. Collect coins, stamps, or sports memorabilia. Practice sports statistics and trivia. Go for hikes and catalog leaves, plants, and insect specimens. Grow a garden or vegetable from seed. Learn cooking while teaching the physics and chemistry of it, or focus on the artistic aspects. Explore your local road maps and learn navigation skills. Put a world map on the wall, then throw a dart at a country and grab a book on it from the library. Draw comics or try digital art. Draw dinosaurs. Build PCs from spare parts or try retro computing or vintage electronics. Do online coding for kids. Try robotics kits. Learn how to do bike tune-ups and maintenance, then get old grody bikes from friends and refurbish them. Try a new game monthly like Chess, Go, or Backgammon. And an important one would be to take advantage of local geography and culture. For example, in Illinois and Wisconsin, we can enjoy the geology and ecology of the Great Lakes, or the architecture of Frank Lloyd Wright.