Las Vegas, long considered Orlando’s top tourist destination rival, topped the Orbitz reservation service’s list of most popular 2008 tourist destinations.

Orlando placed seventh on Orbitz’s list of top U.S. travel destinations. New York City was second and Chicago ranked third.

Here’s the complete ranking: Las Vegas, first, New York, second; Chicago, third; San Francisco, fourth; Miami, fifth; Los Angeles, sixth; Orlando, seventh; Washington, D.C.; eighth; Boston, ninth; and Atlanta, 10th.

The survey also ranked the top travel weeks of the year. In order, they are: Thanksgiving, Independence Day, Christmas, Memorial Day and the third week of March.