Surfing is a natural tourism sector that has gained popularity in recent years as Salvadoran beaches have become increasingly popular. Surfers visit many beaches on the coast of La Libertad and the east end of El Salvador. The use of the U.S. dollar as Salvadoran currency and direct flights of 4 to 6 hours from most cities in the United States are factors that attract American tourists. Urbanization and Americanization of Salvadoran culture has led to the abundance of American-style malls, stores, and restaurants in the three main urban areas, especially greater San Salvador.