Head to Madison Square Park for an al fresco snack at Shake Shack, a hamburger stand par excellence (and a veritable New York City institution). Line up for a taste of the famous Shack Burger, a flat-top dog, and crinkle-cut fries. It’s summer, so finish up with a frozen custard or a Shackmeister Ale (specially made for Shake Shack by Brooklyn Brewery).