If you haven't been there for a while, give yourself a treat. And if you're on a tight budget, make it on the first Sunday of the month through May 1st since no admission will be charged.
One of my favorites: A Street in Venice - John Singer Sargent
Friends or Foes? - Frederic Remington
Autumn in Montclair - George Inness
Undertow - Winslow Homer