Street photography. This is a very relaxing activity, where your brain is at rest while observing the world and walking.

Good things that happened to me:

I travelled in all the region to diversify my pictures.

I bought the books of master photographs to learn their technics, so I can now "read" a picture.

And of course I watched a lot of photos on the internet to diversify my tastes.

Now that I have reached a level that I am proud of, I praise that hobby very much.