There's loads of spots depending on how much time you want to spend on transit. You could park as far out as New Haven CT or Brewster NY and take the regional rail (MTA) in to Grand Central. Though that's a 2 hour trip.

I guess it depends on what tradeoffs you'd prefer to make.

• You can drive all the way, pay the tolls, and put your car in a garage all day for $60-80 (or more).
• Chance it with street parking and figuring out when/which meters you have to feed, and whether you have to move your car every two hours or whatever
• Pick your favorite station that looks like it has parking nearby on google maps, and decide how much time on the train is too much that you'd have preferred to just pay for the garage anyway