Begin your day with breakfast at Barney Greengrass (541 Amsterdam Avenue at 86th Street, www.barneygreengrass.com). Take the 1 or 2 train to 86th Street and this New York City institution is just a short walk from the subway stop. Be aware, it's closed on Mondays, but any other day you'll be able to enjoy breakfast starting at 8:30 (the store opens at 8 a.m. if you're more take-out inclined). Known as "The Sturgeon King," Barney Greengrass has been around since 1908 and is best known for its outstanding smoked fish, so don't miss it atop a bagel or with scrambled eggs and onions. Be warned, it's not a cheap breakfast, but it's a real only-in-NYC experience. If you're visiting on a weekend, arriving early is the best way to avoid crowds (& waiting for a table), but you'll want to anyway in order to make the most of your day in New York!