Not settling into routine is also really healthy for your brain, as far as I heard. After some years of settled life, and walking around my big city (of Moscow, Russia), I feel that I've seen most that it has to offer, walked over most of its streets, and while it is changing in recent years... It just doesn't cut it for me.

I prefer to spend time in other places. And while all cities are quite similar. They do have their own quirks and character, but for me the similarities are greater. Anyhow, even with all those similarities, it takes some time to learn a new place. And then I can move again and again. It is pretty nice, especially in the way that it makes you lose the cruft that tends to gather around you if you spend too much time in one place.