Find a relaxing activity and fit it into your schedule. Walks in the park, reading a book, swimming in the pool. Whatever it is fit it into your daily life.
One of the best ways to reduce stress in one's life is to ensure that you get adequate sleep. Without sleep, one's Locus Ceruleus and HPA axis become hyperactive.
You could try playing video games. They always help me reduce stress as it relaxes me and makes me forget about stressful things. Napping is also very relaxing as it refreshes you and restores your energy.