The Storm King Art Center is, according to its website, "one of the world's most oustanding sculpture parks" and includes works dating from 1945 to the present in a beautiful 500-acre setting. It's a wonderful place to explore on a sunny afternoon, and I'd suggest allowing three hours to casually wander throughout the park. The website notes that it is also beautiful under cloudy or rainy conditions as the sculptures take on a whole new meaning. That could be cool too.
This off-kilter lighter-like structure is an architectural enigma (at least to us):
Although we didn't connect with UFOs, the waves spoke to us:
There is also a little cafe with coffee, gourmet sandwiches and other delicious treats. Food must be eaten in two designated picnic areas. We thought it could be nice to pack a bottle of wine and drink along the way, but you'd probably have to be stealthy about it.
Storm King is an easy one-hour drive from NYC via the Palisades Parkway. Alternatively, the Short Line Bus offers a day trip for just $45.