Hi
As far as hotels, check travelzoo and the NYC lodging specials.
You could bid on a 4Star through Priceline.
www.betterbidding.com or
www.biddingfortravel.com are two sites with good info on priceline.
Metropolitan Museum of Art and Central Park (the museum is suggested donation)
Rockefeller Center and Top of the Rock (do this and skip the Empire State Bldg) then walk around Times Square....possibly see a show
Take the Subway to Brooklyn and walk the Brooklyn Bridge back into Manhattan then take the Staten Island Ferry past the Statue of Liberty
Walk around Chinatown, Soho, and Little Italy
Lower East Side Tenemant Museum
5th ave, the Library, and Bryant Park
www.broadwaybox.com for theater discounts
www.hopstop.com for walking and/or subway directions
www.menupages.com for restaurants by area
There is a ton of GREAT advice on the Trip Advisor New York City Forum!!!