This article highlights the experiences of several people with mental health diagnoses, but I think baking or other creative, physical activities can be helpful for anyone. I can think of times when cooking, baking a loaf of bread or a cake, or making a batch of jam has been a welcome respite in times of emotional or mental turmoil. There's something about turning my attention to what's physically in front of me that can be wonderfully calming and grounding. Making something also brings a sense of satisfaction and achievement.
Gardening, walking, and working with clay are a few other activities I've recently heard people describe as therapeutic for them. What works for you?