To settle the visa issue further, look at this page:
Visitor Visas - Business and Pleasure
Note the following:
Pleasure, Tourism, Medical Treatment - Visitor Visas (B-2) - As examples, if the purpose of your planned travel is recreational in nature, including tourism, vacation (holiday), amusement, visits with friends or relatives, rest, medical treatment, activities of a fraternal, social, or service nature, and participation by amateurs, who will receive no remuneration, in musical, sports and similar events or contests, then a visitor visa (B-2) would be the appropriate type of visa for your travel. If you are going to the U.S. primarily for tourism, but want to take a short course of study which is recreational (and not for credit towards a degree), and the course is less than 18 hours per week, this is permitted on a visitor visa. As an example, if you are taking a vacation to the U.S., and during this vacation you would like to take a two-day cooking class for your enjoyment, and there is no credit earned, then this would be permitted on a visitor visa. A consular officer will determine the visa category you will need based on the purpose of your travel, and your supporting documentation.
For more information regarding travel and tourism in the United States please visit DiscoverAmerica.org.
Persons planning to travel to the U.S. for a different purpose such as students, temporary workers, crewmen, journalists, etc., must apply for a different visa in the appropriate category. If you are taking a course of study which is 18 hours or more a week, you will need a student visa. When traveling to the U.S. to attend seminars or conferences for credit towards a degree, then you’ll need a student visa.