Spend more time with the grandparents. Make more effort towards learning languages and music. Try and have fun with being a kid.

Of course do the get rich stuff when it comes up. Might be able to convince my parents to let me try buying Google or Apple stock and I could buy BTC on my own.

The hard part would be figuring out meeting my wife and having the kiddo. These sorts of “what ifs?” get a lot less fun with those considerations.

Uneven sidewalks and bad bikers still exist.

Cars or not everyone should still wear a helmet when biking.