Are you going to have some extra time to spend? Why not go to New York City or Boston for a day? Below you will find several links to the cities most popular attractions. Be advised, there is much more to do than this in these cities. These are just some of my favorites.
First things first, you will probably need maps of the subway systems and trains.
NYC Subway map
http://www.nycsubway.org/maps/route/
NYC Transit Authority
http://www.mta.nyc.ny.us/
Boston Subway map
http://www.mbta.com/traveling_t/schedules_subway.asp
Statue of Liberty
http://www.statueoflibertyferry.com/index1
NBC Studio Tour - Rockefeller Center
http://www.newyork.citysearch.com/profile/11412744/
Central Park
http://www.centralpark.org/
American Museam of Natural History
http://www.amnh.org/
Empire State Building
http://www.esbnyc.com/
Times Square
http://www.timessquarebid.org
List of all NYC museums
http://www.ny.com/museums/all.museums.html
Staten Island Ferry
http://gonyc.about.com/cs/attractions/p/statenislandf.htm
The Freedom Trail
http://www.thefreedomtrail.org/
Faneuil Hall and Quincy Market
http://www.faneuilhallmarketplace.com/
Visit the bar that inspired Cheers
http://www.cheersboston.com/
Yankee Fleet Whale Watching
http://www.yankeefleet.com/
John F. Kennedy Presidential Library
http://www.jfklibrary.org/
Tour Boston in Style
http://www.bostontours.com/
Harvard Square
http://www.harvardsquare.com/