NYC hot-dog carts, meet the competition: inspired by Danny Meyer’s wildly popular Shake Shack (212/889-6600; shakeshack.com), in Madison Square Park, snack bars are dishing out quick, pedigreed fare in the Big Apple’s green spaces. Battery Park’s Picnick (646/761-1682; mypicnick.com), steps from the Statue of Liberty ferry, offers locally sourced sandwiches and salads. Little Veselka (75 E. First St.; 212/228-9682; veselka.com), a spin-off of a beloved Ukrainian restaurant, serves up borscht and blintzes in an East Village playground. And at Tom Colicchio’s ’Wichcraft (212/780-0577; wichcraftnyc.com) in midtown’s Bryant Park, you can chase your grilled Gruyère with just-made ice cream’wiches—lunch money well spent.