The Future Perfect is my favorite place to shop for furniture / interiors, or pick up a small gift for a friend. They have a perfect mix of beautiful and strange objects, some of my favorites include the Animal Butt Magnets, Shrigley Salt & Petter Shakers, and the Bank in the form of a Pig.
Death & Co is my favorite place for delicious cocktails and small bites. Their truffle mac and cheese and lobster rolls are delicious and love just about every drink on their whisky menu.
I think it takes place every Saturday morning to afternoon, vintage shopping while having a great view at the Manhattan skyline from the East River State park. You will find lots of vintage shops and warehouses around this area of Williamsburg.
You can't say you've seen NYC until you've seen it from a boat. Hop on the ferry from anywhere to anywhere and you'll see what I mean. Not only will you see excellent old buildings and factories--the inner workings of the old industrial city--but you'll head out under working bridges and see the skyscrapers in all their towering glory. And once you've done it, do it again, at night.
I feel like I've watched this plant shop grow up because they've over doubled in size since I first started going! Speaks to the quality of the store and ownership. They have an excellent selection of healthy plants for a great value. This is my go to for green.