I did a course with a life coach, who recommended walking and connecting with nature to be part of everyone's self care programme. I always feel better walking in places where I feel peace. You can get connect into that peace, even you are unable to go on a favourite walk, perhaps because of illness, weather etc. You can visualise the walk.
I'm fortunate to live in a place where you can walk in any direction, but I also enjoy walking in places like London, particularly in backstreets and looking up at architecture and history.