Governor's Island is a fabulous NYC experience that is unique and rather  "un NYC"  It provides an experience that is off the beaten path, is fresh and a wonderful outing that starts as soon as you board the ferry.  It feels like you are ambling through a small town yet there you are those fabulous views of the NYC skyline. It has open fields, bike paths and even a beach.

Great for families because the kids can run free is a fabulous bucolic setting. The price is right ( no charge at all)  You can take a wonderful informative tour or just veg out.

It is easy to get to by public transportation ( #1 train to the last stop- South Ferry is the most direct )

Check out their website for specific activities