1. Avoid large crowds (which also helps lessen the spread of the flu),
2. Avoid National or commercially famous landmarks,
3. If you hear an explosion, run the other way. Apparently the terrorists monsters often set off a small device. "Typical" human nature predicts that most people will run towards the small explosion only in time for the monster to set off a very large explosion. Run away from an explosion.
4. Stock up on bottled water and food.
5. Give your kids and those you hold dear a big hug. Be strong, relax, smile and enjoy life. If you panic, the terrorists win.