I'm a big fan of having noise cancelling earphones in with no music or audio when going for a walk. It's amazing how it forces you to think as you say and brings a kind of clarity.
I am a big fan of walking around in nature (even parks) enjoying nature sounds. It positively affects my mood. Bird sounds are my favorite, but while in bed I love the rain outside.
No doubt this website has a better range of sounds, but this is also built into iOS/MacOS as an accessibility feature which means you can use it even when offline.
Everything has its moments :) Most of the times I like complete silence, so often I sit up until 3-4 so I can sit on the balcony for 10/15 minutes in complete silence. Other times walking in nature hearing the environment and animals brings a lot of mindfulness and introspection. I've been nostalgic for the sounds of a running train in the past too, or just the rumble of living next to a busy plaza, but too much of that would be annoying too.
