Buffalo Exchange is one of the best consignment shops around. There's great staples plus designer and vintage pieces for a steal.
Brooklyn Flea, sited near water's edge under the Williamsburg Bridge. In the summer, Smorgasburg (a massive food truck festival) is held in a lot next to Brooklyn Flea every weekend. Thankfully, a lot of the food is available indoors among the unique vendors, antique items and handmade wares year-round.
If all that antiquing worked up an appetite, The Meatball Shop is the perfect place for a meal or small bite. Pick from meatball subs or mix and match individual ball options. My favorite is the vegetarian ball, and if you're in the mood for a cocktail, they make one heck of a Moscow mule.Barcade. Yep, it's what it sounds like—an arcade filled with old-school games (like classic Pacman and Frogger), and they also serve beer. Bring quarters or cash to get some from the machine.
Barclays Center. There's tons of musical performances hosted at the venue, and the New York Islanders and Brooklyn Nets play there. It's a 15-minute cab ride from Williamsburg, or if you're on a budget, easily commutable from the J train. Or, check Eventbrite to see what else is going on nearby!