Via the TZx: The Rockland County Dept of Transportation will send “Tarrytown only” Tappan Zee Express buses to both the Tarrytown and White Plains Metro North stations until further notice. TZx/Metro-North Tarrytown Unitickets and other Hudson Line commutation tickets will be honored on Harlem line trains from White Plains.
Rockland Coach: You can take the 9a bus (or 9t or 9at) bus to the Port Authority bus station at the GWB or 42nd Street in Manhattan. The trip will take you about 75 minutes.
Garden State Parkway Park and Ride in Montvale: You will need to drive to New Jersey, but once you get on the bus it’s non-stop to the 42 Street Port Authority Bus Terminal. The Park and Ride is attached to the first rest area you see on the GSP going South, about 15 minutes from Nyack.
NJ Transit from Suffern: You can take the train from Suffern almost all the way to NYC (you will need to switch to the PATH or another NJ Transit train to cross the river). Until service is restored on the Hudson River Line south of Yonkers, NJ transit is accepting Hudson Line commutation tickets on both the Port Jervis and Pascack Valley Lines.
Park and Ride on NYC’s doorstep: Two convenient close-to-Manhattan Park and Ride’s are also available at the Vince Lombardi Park and Ride and Rt 3 / North Bergen Park and Ride. For a single +/- $10 ticket, you can park all day and get bussed from the lot to the PABT at 42nd Street.
The Rockland County Dept of Transportation has more details on these options as well as ferry service from Haverstraw.