Greenbean, ignore the nasty people who attack you for standing up for your values, and falsely accuse you of 'hating the US' because you have more values than they do.
Some tips:
The US is big. It'd be easy to waste too much time driving around, and a lot of the country is the same sprawling chains and houses not worth visiting.
It's better to pick a few highlights. It's up to you what you want to see.
Some places are 'unique destinations'. New York City has various things from museums to restaurants to the UN. New Orleans has a French-influenced Jazz and food feel to it.
There are regional places to experience - 'the south' such as you find in North Carolina to Atlanta; the mid-west, Seattle or Portland with their green-minded people and more.
Washington D. C. is an experience; you can see the capitol and the Smithsonias alone can take days.
Nature, depends what you want - hard to go wrong with a carefully planned visit in California to Redwoods and Yosemite. There are lakes, mountains, deserts and so on.
A guidebook might be of help.
A main thing I'd say is don't get bogged down in a spot that doesn't offer a lot - it's easy to go to a big city and not see much of what's there.
There are also little treats you miss out on that the book might help with - for exampe, if you fo to Atlanta, would you know to take the CNN tour - which last I checked, lets you experience what it's like to be a news anchor, giving you a video recording or you reading a news summary?
Maybe you'd enjoy seeing a television show taped in Hollywood live? There are many.
In Vegas, there's one thing most worth seeing IMO - a few of the Cirque Du Soleil shows. See Ka, O, and Mystere; the Beatles if you like; skip Zumanity.
Internet hotel booking sites seem to have decent deals - I'd try that over last minute booking, but do keep some flexibility to your travelling so it's not too rushed.
If you want to try a great steak restaurant in New York, try Peter Lugar's' Portehouse for two.
If you go to San Francisco, skip Fisherman's Wharf, designed for tourists - there are a lot better things to see.
Walt Disney World in Orlando, FL might be of interest; great resorts to see, and the world showcase in Epcot.