On the streets of Havana, tourism is booming, especially with Americans.The number of Americans traveling to Cuba has tripled in recent years. But that surge could be coming to an end.U.S. President Donald Trump will lay out his new Cuba policy on Friday, and U.S. officials say Trump will make clear the ban on American tourism in Cuba still stands.Tougher enforcement of current travel rules are on the horizon. Much to the disappointment of bar owner Yuri Barroso.