Whatever that entails for you.
for some of us its Sports, Ultimate Frisbee, Volleyball, Tennis, etc.
for others its Video Games.
for some its running thru the woods barefoot.
for some its Grok Tag or Mountain Biking
Read a book. A Fiction Book. Let your mind wander to a place where YOUR issues arent a concern. An exciting story told by a good author will relax you and let you forget your stresses.
Build something. A Backyard Garden. Dig a Koi Pond. Make a Birdhouse. Paint. Decorate. Design. Start a Blog! (mines @ http://www.thorsays.blogspot.com)
Honestly, one of the best ways to relax. Take a short nap during the day. Then get plenty of sleep at night.
Spend some time with positive upbeat people. Social entertainment with optimistic individuals is energizing.
Yoga, Sprinting, A long walk. Get your body moving, work up a sweat and get some wonderful Endorphins pumping. Endorphins are our bodies reward for keeping it healthy!
I just got an hour long massage, followed by incredible sleep, so worth it