"Cuba is the only country in the world the U.S. government restricts its own citizens from
visiting. Americans can go to Burma, Iran, even North Korea if those places give them a visa.
"The Obama administration has now relaxed travel rules for Cuba, leading to a surge in U.S.
-government approved tours to the island....
"Last year, some 400,000 U.S. travelers visited Cuba, making the United States the second-
largest source of foreign visitors to the island after Canada. Most were Cuban-Americans
coming to see family...
http://www.npr.org/2012/02/06/146474813/u-s-travel-to-cuba-grows-as-restrictions-are-eased
"Tourist travel to Cuba is prohibited under U.S. law for citizens and others under U.S.
jurisdiction.
"Authorized travelers to Cuba are subject to daily spending limits. See the Office of Foreign
Assets Control page of the U.S. Department of the Treasury.
http://travel.state.gov/content/passports/english/country/cuba.html