ONE WORLD TRADE CENTER is rising, and the 9/11 Memorial will open right below it next month on the 10th anniversary of the terrorist attacks. Although progress on the World Trade Center site has been slow, the surrounding neighborhoods did not wait to revive (and in some cases reinvent themselves) after all the emotional and economic devastation. The financial district is bustling, Chinatown is as quirky and enticing as ever, and TriBeCa is bursting with new restaurants, bars and hotels. With the exception of those seeking a night of relentless club-hopping, travelers hardly need venture north of Canal Street for a complete New York weekend.