There are numerous options in the time you have and with your budget. What kinds of things are you interested in? Are you looking for outdoor activities, museums, historic sites, or what? It helps us help you better if we have an idea of what interests you.

If it was me, I think I'd either head up to northern Minnesota to check out some of their "thousand lakes", or Niagara Falls, or to see if the blue grass of Kentucky is really blue, or Gettysburg, PA, to scope out the historic battlefield.

Again, let us know what type of things you're seeking and we can give more specific advice.