Start playing a musical instrument. Some who suffer from tinnitus have found some degree of relief from learning to play an instrument that requires breath work, such as a trumpet or flute. Whether or not it helps the sound in your ears, learning an instrument removes focus from tinnitus, and you will also develop an enjoyable and enviable skill.
You want to try to limit how often you expose yourself to loud noises. This exposure could be from work-related sounds like chain saws or jackhammers, or it could be from things you enjoy like concerts and MP3 players. So turn down the volume or wear earplugs and protect your ears.