Everyone has passion in something ,find your own and try to take it to the next level or just do it, because its truly away to take all the stress and too much thinking off and relaxes you for some time. you could be good in handcrafts, art (painting) , music, or cooking.
lets take cooking as an example of relaxation way and a trick to be stress free , because personally it's one of those things i love to do to help in fix my mood in bad days.
you can be creative in your kitchen, don't be afraid to play with food and ingredients , just don't burn the house.
as for me I love exploring new flavors especially spices , that's why whenever i feel low or got too much in my mind, i would go to the supermarket and do some shopping for food recopies or just search and explore for ingredients and spices. i come of up with new ways in making meals and dishes, i truly find it relaxing to cook, because cooking to me is the one of few things i do without roles. it just takes me to another world and simply i see it as an art. so find your own thing you do the best , and it doesn't have to be cooking.