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You are going to need a lot more time than one month to take in all the sites that have been mentioned already unless you have a private jet to shuttle you around the U.S.. Personally, I would not come all the way to America to spend time in the big cities as I am sure they are not too different from where you live. I would love to go to Alaska and will do so one of these days but some of the other places mentioned is where I would be spending my time. Niagara Falls, Yellowstone, Grand Canyon, Hoover Dam, Monument Valley, Yosemite and a bunch of places in between are the places to see in this country. I could take a road trip and travel for a year or more and just see all the sites and places in the country. One of these days I plan on doing so.