Visit Governor’s Island in New York Harbor. The free ferry leaves from Fulton Ferry Landing in DUMBO, Brooklyn all day long on weekends.
It offers views of Brooklyn, Lower Manhattan, New Jersey, Staten Island, and The Statue of Liberty, you can rent bikes, see the old military forts, and get snacks from some fancy food trucks. Open Saturdays and Sundays.
Also located at Fulton Ferry Landing:
The Brooklyn Ice Cream Factory!
The brand new, awesome Brooklyn Bridge Park!
And just a short walk away in DUMBO, Jacques Torres Chocolates and Almondine Bakery (best croissant in the city!)