Since the U.S. is so large, most visitors will have in mind a number of specific destinations to visit before planning a trip. The best way to get tourist info is to visit the tourist boards for the individual states or cities, as there is no centralized tourism site for the entire country.

Any traveler who is not a U.S. citizen should check out http://www.unitedstatesvisas.gov/ for visa information prior to their trip. Picking up a travel guide (or printing out sections of this one) may be prudent if you plan on taking a roadtrip across the U.S.