Work PT in a job that isn't too taxing - i.e. I don't wake up in the night stressed and panicky, as I used to do in my original career field - but which is busy and fulfilling, with lovely people to work with
Some volunteer work, but not too much - I've overdone the volunteering in the past and have found it can have a negative effect on your self-esteem if you do too much
Gardening - lots
Fresh air and going for walks
No regulation of what I eat/drink, within sensible boundaries - I don't deny myself treats but I don't go mad either - everything in moderation.
A regular routine - I get up at the same time every day (6:15 in term time, slightly later at weekends) and never let myself have long lie ins as they make me feel sluggish and mentally low. Pyjama days are banned in our house for the same reason.
I shower every morning without fail. Wash hair, shave legs, put a bit of makeup on even if I'm going anywhere. Makes me feel fresher, more alert and attractive.
and finally - only doing things socially if I really want to. I am quite happy in my own company (DH and DC aside) and find that if I book in too many social things I get quite stressed, so I've learned to manage this better over the years.