The idea that laughter is the best medicine is especially true for stressful situations. Most biologists now believe that laughing evolved as a response to a stressful or dangerous situation, so take advantage of your own body's biology and find a way to make yourself laugh. Even if you are unable to laugh for real, fake laughing can also release tension.
A good tip that can help you keep your stress levels down is to stop comparing yourself to everyone that you meet. If you're always worried about what other people have and what you don't have, you'll never be happy. All you can do is focus on yourself.
A fun tip to remember when dealing with stress is to listen to music. Although you may not think so, listening to your favorite music can actually provide you with energy. Listening to music lifts your spirits and makes you happier, which is a great combatant for stress.