The redwoods in California.
Grand Canyon in Arizona, YellowStone National Park in Wyoming.
Miami, Florida. (the State of Florida has most of
the theme parks like DisneyLand, and so on, but Miami is quite a unique city)
Las Vegas (the oasis in the desert) Great for gambling, and other entertainment.
Chicago, Illinios.
The entire west coast.
The Entire east coast..... but the west coast is nicer and more picturesc in my opinion. Google the Pacific Coast Highway.
If you can afford it, I would recommend renting a car and traveling around to multiple locations throughout the country, but that would also require a ton of time, as well as money.
There are guidebooks that will describe the various attractions and sights in all the US states, as well as on-line sources. Each state has a department of tourism, so you could search _[name of state] tourism_ to get leads to info. Fodor_s and Frommer_s have printed and on-line guides to various states and countries.
If you decide to visit New York state, e.g. Niagara Falls, be sure and look into the Finger Lakes region of central NY. It was recently named the best lake destination in the world! It_s beautiful and quiet.
i reccomend new york city though!or los angeles.but those places might be too in-your-face becasue of the fast-pace life.
if you want a laidback trip i reccomend miami