What activity did you dislike as a child but is awesome as an adult?

Spending time outside, taking walks in the woods.

Eating Brussel sprouts.
If they are seasoned and roasted correctly and not boiled, they are quite good.

Early bedtime, now I love going to bed at 8:30.

Jogging/running

Nap time

Early night.

Naps

Having nothing to do. When I was a kid, I would be bored. Now, it's like an opportunity to chill.