I rode NYRATS, New York Ride Across the State, which went from Niagara Falls/Buffalo to New York City. The only public place I know of to view the maps is at http://libweb1.lib.buffalo.edu:8080/findingaids/view?docId=ead/archives/ubar_ms0091.xml
If you get to Buffalo, I suggest going a little further to Niagara Falls. View is better if you cross into Canada.
In general, the route follows a diagonal path through the Finger Lakes region; hilly. You will also cycle though the Catskills; hilly. Catskill: where Rip Van Winkle woke from his sleep.
Going north from NYC traffic is lighter west of the Hudson River; you can ride over bridge at Newburgh.