Popup Florist and the Elk coffee bar made their way from Manhattan to Montauk. Parked next to Cynthia Rowley’s boutique through Labor Day, the collaboration called Coffee + Flowers sells barista brews, bouquets and beachy wares from its stylish neighbor. 696 Montauk Highway; thepopupflorist.com. theelknyc.com. cynthiarowley.com