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Tinnitus is made worse by caffeine and alcohol... dammitall.
Timrhu mentioned driving with earplugs. Working past my aversion to most things Bose, I recently bought some Bose QuietComfort 20i noise-canceling headphones. They are, in a word, outstanding!
When driving (or on an airplane, or when the neighbors are mowing the lawn, etc...), you can plug these into an iPod, or else just activate them without listening to music.
The moment I hit the switch, I usually say, "Ahhhh...." You rarely realize how noisy the world is until you pop these in.
Over the long run, they can really save the ears, and I've noticed that engine noise and background sounds don't fire up the tinnitus nearly as badly.
Had I known that this technology would be so useful, I would have bought them much earlier.