My stay in USA lasted 4 months. During the first two months I have not had many days off so I did not have the possibility of requiring additional work. I asked for extra work watching ads in local newspapers and touring the city, very often were highlighted message type we are hire workers, need assistance etc. Washington, of course, a very interesting and beautiful city. They were very liked the museums, I visited a total of around 7-8. Most museums are free (totally cool), I kept most (of entire 5 hours) at the National Air and Space Museum, the phenomenal i would recommend everyone to visit it. Strong impression on me left and Museum of Natural History. Everything is transparent, clear, informative, can be a lot to learn to be seen.