Effective January 23, 2007, some new travel rules are going into effect. The U.S. State Dept. has created an FAQ  that answers questions you or your patrons may have. Here's the skinny: if you are traveling by air to Canada, Mexico, Central and South America, the Caribbean, or Bermuda youi will be required to present a valid U.S. passport. This change is for air travel only. Land or sea passengers may be required to present passports as well, but not until after January 1, 2008.