Self care, for me, is making sure I have at least one, and usually two, long walks every day. Having an active dog really helps with that. I feel so much fitter (and calmer) when I spend time outside.
I really need a sense of purpose and achievement too, so I do a little 'work' daily (maybe just an hour) before indulging in hobbies. I'll bargain with myself 'Clean one window and then read that book!'.
I treat myself too. Yesterday, two ice lollies (it was hot), today I'm making peanut butter almond cookies - all healthy stuff, apart from the maple syrup. Maybe I'll make half a batch, as I'm bound to eat them all.